Choosing the Right Sunscreen

The skin has evolved to protect us from the harmful effects of ultraviolet light. Sunscreens were first developed to prevent sunburns by blocking UVB; they allowed us to prolong our time in the sun, but that resulted in increased exposure to UVA. Modern sunscreens attempt to block the whole spectrum of UV light, so are called broad spectrum. Not all so-called broad spectrum sunscreens protect skin from the whole range of UVA.

Negative Effects on the Skin:

Most of us know that sun exposure has immediate positive and negative effects on the skin. The positive effects include a sense of warmth and pleasure and Vitamin D production. The medium and longer term effects are negative and must also be recognised.

Short Term Effects:

• Sunburn, or tan
• Photosensitive rashes
• Drug and chemical photo toxicity and allergy reactions
• Light aggravated conditions

Negative Medium Term Effects:

• Photodamage (Click here to learn more.)
• Photoaging

Negative Longer Term Effects:

• Skin cancer (Click here to learn more.)
• Photoaging

A Comparison on UVA and UVB

UVA and UVB light have different characteristics.

UVA* (320-400nm)

• Levels are constant throughout the year
• Penetrates into the lower dermis
• Penetrates glass
• 95% of UVL is UVA
• May be important in causing melanoma
• Tans the skin
• Causes most of the aging effects seen in the skin
• Immunosuppressive
• Phototoxic reactions to drugs and chemicals
• Responsible for many photodermatoses

*It should be noted that sun-tanning beds use mainly UVA light. There is no such thing as a “safe” suntan. Recently the US FDA began investigating whether suntan beds should be illegal for anyone under the age of 18 years.

UVB (290-320nm)

• Amounts vary and increase in the summer, at noon, and on the equator
• Most only penetrates the epidermis
• Does not go through glass
• SPF of sunscreens only measures UVB blockage
• More carcinogenic than UVA
• Sunburns the skin
• Needed for Vitamin D production

Sunscreen Use

Key Points:

• Broad spectrum only should be used.
• SPF is only related to UVB protection and does not provide a reference to the UVA protection in the product.
• All sunscreens will have UVB protection, which is reflected in the SPF.
• If a skin sunburns in 10 minutes, a properly applied sunscreen SPF 15 means they will burn in 150minutes
• Physical screens reflect light whereas chemical screens absorb UV converting the energy into heat
• SPF15 blocks 87.5% of UVB and SPF 50 blocks 98% of UVB.

About the author:

Richard Thomas, MD, FRCPC is Assistant Professor of Clinical Dermatology, Department of Dermatology, University of British Columbia, Vancouver, Canada.

Combination Skin Treatments

Combination skin is characterized by a mixture of oiliness and dryness. Typically, the oily areas tend to be the T-zone, consisting of the forehead, nose and chin. The cheeks are normal to dry. The degrees of oiliness and dryness can vary. Pores may be larger in the oily areas – with pimples, blackheads and breakouts sometimes occurring – and dry areas may feel rough and irritated.

The “tissue test” can help you determine if you have combination skin. Take a tissue and hold/press it against your face. If there’s oil on the tissue where it touched your T-zone, but no oil where the tissue touched your cheeks, you most likely have combination skin.

Causes
Many factors can cause combination skin, including hormones, age, genetics, the way in which lipids are organized in our skin and even the weather. Hormonal changes can lead to changes in skin’s oiliness or dryness. Teens and young adults tend to have oilier skin, especially in the T-zone, but with age, hormones change and the oil production may decrease (but unfortunately, acne is still an issue for many adults). Also, hormones change due to menstruation and the birth control pill, which can make skin oilier in certain areas. Lipids also play a role in combination skin: These proteins affect skin’s softness and feel. When lipids aren’t evenly spread throughout the skin, certain areas will feel drier and rougher, while other areas may feel soft but oily or greasy. The organization of lipids in skin is due to genetics and hormones. Finally, weather can exacerbate combination skin. Dry cold weather can cause skin to dry out and become irritated. Conversely, hot humid weather can increase oil production. This can affect your T-zone as well as your cheeks.

Care Plan
Combination skin requires special care to balance the oily and dry areas of the face. Proper cleansing, treatment, moisturizing and sun protection are all necessary.

• Cleansing: People with combination skin often have difficulty finding a cleanser that works for their unique skin needs. Formulas designed for oily skin may leave combination skin too dry, especially in the cheeks, while formulas designed for dry skin may leave combination skin greasy, especially in the T-zone. It’s best to avoid products that are either too drying or too rich. Instead, use a foaming or gel cleanser to get rid of dirt and oil without causing irritation or dryness. A cleanser to try is one that removes excess oil and impurities while still being gentle and not drying out skin.
You should also exfoliate your skin regularly to remove dry, dead, rough skin cells. These cells may be particularly prominent on your cheeks. They can flake off and block pores, causing blemishes and blackheads. Try a product that might include papaya and pineapple juice, olive derivatives and Ginkgo Biloba

Treatments: Treatment products are another important skincare component, helping to balance your skin. One treatment to try is one which moisturizes dry areas but prevents excess oil, especially in the T-zone. This product also contains antioxidants to prevent aging. Another type of treatment is a mask, and you’ll find an array of products for every skin type. Some experts advise using a hydrating/moisturizing mask on dry areas (cheeks) and a deep-cleaning clay mask on oily areas (T-zone). While using two different masks is certainly an option, you can also use a mask specifically designed for combination skin. If you suffer from breakouts, which may occur around the T-zone, use acne treatment products with salicylic acid. For problem skin, try a blemish serum or a spot treatment.

Moisturize: Combination skin needs balance, and part of that balance means moisturizing your skin. Moisturizing is especially important for drier areas of the face, but your entire face needs moisture. Some experts suggest using separate moisturizers – a lightweight one for the T-zone and a deeper one for cheeks. You may choose to use separate moisturizers, but you can also use a single moisturizer designed for combination skin. Try a lotion which balances skin with witch hazel and aloe extract to help skin stay soft. Pay careful attention to dry areas, as they may require more frequent moisturizing than oily areas. Generally, experts recommend moisturizing dry areas twice a day and moisturizing oily areas once a day. Keep in mind that your individual skin has unique needs, so you might want to adjust your moisturizer – how often you use it, where you need it and how much you need.

Sun Protection: Like all other skin types, combination skin needs protection from the sun. UVA and UVB rays can damage skin, so use oil-free sunblock all over your face daily (and on any other exposed areas). Try an oil-free sunlotion or sunblock because it protects your skin from UV rays and won’t make skin greasy.

Natural Treatments
Natural treatments such as aromatherapy oils, home-made exfoliants and masks may help treat your combination skin. For example, try mixing essential oils like chamomile, lavender and ylang ylang (just a few drops) together with your oil-free moisturizer. These ingredients have antibacterial properties and may help to rid skin of dirt or bacteria. However, if your skin is sensitive or easily irritated, or if you’re pregnant, you shouldn’t use these essential oils.

Exfoliating treatments can be made at home by mixing and grinding nuts, seeds or oatmeal along with water. These will slough off dead, dry skin cells – especially common around the cheeks. You can add citrus peels from fruit – like orange or grapefruit – to the mix and apply it to the oily T-zone.
To make a mask for dry areas, use ingredients like yogurt, mashed bananas or avocados to moisturize. On oilier areas, try pureed strawberries and apples.

Sun Safety for Skiers

Higher altitude means increased levels of harmful UV exposure compared to sea level areas. UV exposure increases 8-10 percent with every 1,000 feet above sea level. At an altitude of 9-10,000 feet, UV may be 45-50 percent more intense than at sea level. In addition, snow reflects about 80 percent of the UV light from the sun, meaning that you are often hit by the same rays twice. This only contributes to the problem, further increasing the risk for skin cancer.

The combination of higher altitude and ultraviolet (UV) rays reflected by the snow puts skiers and snowboarders at an increased risk of sun damage and ultimately, skin cancer. More than 90 percent of all skin cancers are caused by sun exposure. It’s easy to associate winter with frostbite and windburn, but most people are unaware that UV rays can be even more damaging on the slopes than on the beach,it’s important to take proper precautions while on the slopes.

Both snow and strong wind can wear away sunscreen and reduce its effectiveness, so you have to take extra precautions. To protect your skin from the bitter cold, heavy winds and winter sun, follow these important sun protection tips:
• Use a broad-spectrum sunscreen with an SPF of 15 or higher whenever you spend time outdoors. Apply 30 minutes before hitting the slopes.Be aware that the sun’s reflection off the snow is strong even on cloudy days.
• Apply sunscreen liberally and evenly to all exposed skin – most skiers and snowboarders do not use enough sunscreen and therefore do not get the maximum protection.
• Use a more moisturizing sunscreen. Winter conditions can be particularly harsh on the skin.
• Be sure to cover often-missed spots: lips, ears, around eyes, neck, underside of chin, scalp and hands.
• Always wear a lip balm with an SPF 15 or higher. Lips are even more sensitive than most parts of the skin.
• Reapply at least every two hours, and more often after sweating or exposure to wind and snow.
• Carry a travel-sized sunscreen and lip balm with you on the slopes. Reapply on the chairlift, especially after a long, snow-blown run.

Cover up.

• Wear items like ski masks, which will cover most of the skin, leaving very little exposed to the wind and sun.
• UV-blocking sunglasses or goggles that offer 100% UV protection and have wraparound or large frames protect your eyelids and the sensitive skin around your eyes, common sites for skin cancer and sun-induced aging. The sun’s rays and glare can impair your vision, so it’s important to wear sunglasses or goggles to clearly see the terrain. Plus, it will increase your enjoyment and performance while skiing.
Be mindful of time spent in the sun, regardless of the season.
• Keep track of the time you spend in full sunlight. If possible, ski early in the morning and later on in the day, before 10AM and after 4PM. This helps avoid long lines and decreases the amount of time spent outdoors in the most intense hours of sunlight.

• If you are on the slopes for most of the day, take a few breaks indoors to reapply sunscreen.
• Drink plenty of water to avoid dehydration from the sun.
Enjoy the winter season, but be sure to take care of your skin to avoid the damage the cold season can cause.

The first organization in the U.S committed to educating the public and medical professionals about sun safety, The Skin Cancer Foundation is still the only global organization solely devoted to the prevention, detection and treatment of skin cancer. The mission of the Foundation is to decrease the incidence of skin cancer through public and professional education and research.

UV radiation

For a six billion-year-old star, the sun is certainly in the news a lot lately, mainly because it is still a source of uncertainty and confusion to many of us.

The center of this confusion is the sun’s ultraviolet A (long-wave) and ultraviolet B (shortwave) rays. Our understanding of exactly what kinds of damage each causes to the skin, and how best to protect ourselves, seems to shift every year as new research comes out. For example, it was once thought that only UVB was of concern, but we keep learning more and more about the damage caused by UVA. And new, improved forms of protection against UVA keep emerging. Keeping up with these new developments is a worthwhile challenge that can help all of us prevent sun damage.
What is Ultraviolet Radiation?

UV radiation is part of the electromagnetic (light) spectrum that reaches the earth from the sun. It has wavelengths shorter than visible light, making it invisible to the naked eye. These wavelengths are classified as UVA, UVB, or UVC, with UVA the longest of the three at 320–400 nanometers (nm, or billionths of a meter). UVA is further divided into two wave ranges, UVA I, which measures 340-400 nanometers (nm, or billionths of a meter), and UVA II which extends from 320–400 nanometers. UVB ranges from 290 to 320 nm. With even shorter rays, most UVC is absorbed by the ozone layer and does not reach the earth.

Both UVA and UVB, however, penetrate the atmosphere and play an important role in conditions such as premature skin aging, eye damage (including cataracts), and skin cancers. They also suppress the immune system, reducing your ability to fight off these and other maladies.
visiblelightuvdiagram.jpg
UV Radiation and Skin Cancer

By damaging the skin’s cellular DNA, excessive UV radiation produces genetic mutations that can lead to skin cancer. Both the U.S. Department of Health and Human Services and the World Health Organization have identified UV as a proven human carcinogen. UV radiation is considered the main cause of nonmelanoma skin cancers (NMSC), including basal cell carcinoma (BCC) and squamous cell carcinoma (SCC). These cancers strike more than a million and more than 250,000 Americans, respectively, each year. Many experts believe that, especially for fair-skinned people, UV radiation also frequently plays a key role in melanoma, the deadliest form of skin cancer, which kills more than 8,000 Americans each year.
UVA

Most of us are exposed to large amounts of UVA throughout our lifetime. UVA rays account for up to 95 percent of the UV radiation reaching the Earth’s surface. Although they are less intense than UVB, UVA rays are 30 to 50 times more prevalent. They are present with relatively equal intensity during all daylight hours throughout the year, and can penetrate clouds and glass.
normalskincellsandtumorcells.jpg

UVA, which penetrates the skin more deeply than UVB, has long been known to play a major part in skin aging and wrinkling (photoaging), but until recently scientists believed it did not cause significant damage in areas of the epidermis (outermost skin layer) where most skin cancers occur. Studies over the past two decades, however, show that UVA damages skin cells called keratinocytes in the basal layer of the epidermis, where most skin cancers occur. (Basal and squamous cells are types of keratinocytes.) UVA contributes to and may even initiate the development of skin cancers.

UVA is the dominant tanning ray, and we now know that tanning, whether outdoors or in a salon, causes cumulative damage over time. A tan results from injury to the skin’s DNA; the skin darkens in an imperfect attempt to prevent further DNA damage. These imperfections, or mutations, can lead to skin cancer.

Tanning booths primarily emit UVA. The high-pressure sunlamps used in tanning salons emit doses of UVA as much as 12 times that of the sun. Not surprisingly, people who use tanning salons are 2.5 times more likely to develop squamous cell carcinoma, and 1.5 times more likely to develop basal cell carcinoma. According to recent research, first exposure to tanning beds in youth increases melanoma risk by 75 percent.
UVB
uvradiation3.jpg

UVB, the chief cause of skin reddening and sunburn, tends to damage the skin’s more superficial epidermal layers. It plays a key role in the development of skin cancer and a contributory role in tanning and photoaging. Its intensity varies by season, location, and time of day. The most significant amount of UVB hits the U.S. between 10 AM and 4 PM from April to October. However, UVB rays can burn and damage your skin year-round, especially at high altitudes and on reflective surfaces such as snow or ice, which bounce back up to 80 percent of the rays so that they hit the skin twice. UVB rays do not significantly penetrate glass.

Sun Safety for Skiers

Higher altitude means increased levels of harmful UV exposure compared to sea level areas. UV exposure increases 8-10 percent with every 1,000 feet above sea level. At an altitude of 9-10,000 feet, UV may be 45-50 percent more intense than at sea level. In addition, snow reflects about 80 percent of the UV light from the sun, meaning that you are often hit by the same rays twice. This only contributes to the problem, further increasing the risk for skin cancer.

The combination of higher altitude and ultraviolet (UV) rays reflected by the snow puts skiers and snowboarders at an increased risk of sun damage and ultimately, skin cancer. More than 90 percent of all skin cancers are caused by sun exposure. It’s easy to associate winter with frostbite and windburn, but most people are unaware that UV rays can be even more damaging on the slopes than on the beach,it’s important to take proper precautions while on the slopes.

Both snow and strong wind can wear away sunscreen and reduce its effectiveness, so you have to take extra precautions. To protect your skin from the bitter cold, heavy winds and winter sun, follow these important sun protection tips:
• Use a broad-spectrum sunscreen with an SPF of 15 or higher whenever you spend time outdoors. Apply 30 minutes before hitting the slopes.Be aware that the sun’s reflection off the snow is strong even on cloudy days.
• Apply sunscreen liberally and evenly to all exposed skin – most skiers and snowboarders do not use enough sunscreen and therefore do not get the maximum protection.
• Use a more moisturizing sunscreen. Winter conditions can be particularly harsh on the skin.
• Be sure to cover often-missed spots: lips, ears, around eyes, neck, underside of chin, scalp and hands.
• Always wear a lip balm with an SPF 15 or higher. Lips are even more sensitive than most parts of the skin.
• Reapply at least every two hours, and more often after sweating or exposure to wind and snow.
• Carry a travel-sized sunscreen and lip balm with you on the slopes. Reapply on the chairlift, especially after a long, snow-blown run.

Cover up.

• Wear items like ski masks, which will cover most of the skin, leaving very little exposed to the wind and sun.
• UV-blocking sunglasses or goggles that offer 100% UV protection and have wraparound or large frames protect your eyelids and the sensitive skin around your eyes, common sites for skin cancer and sun-induced aging. The sun’s rays and glare can impair your vision, so it’s important to wear sunglasses or goggles to clearly see the terrain. Plus, it will increase your enjoyment and performance while skiing.
Be mindful of time spent in the sun, regardless of the season.
• Keep track of the time you spend in full sunlight. If possible, ski early in the morning and later on in the day, before 10AM and after 4PM. This helps avoid long lines and decreases the amount of time spent outdoors in the most intense hours of sunlight.

• If you are on the slopes for most of the day, take a few breaks indoors to reapply sunscreen.
• Drink plenty of water to avoid dehydration from the sun.
Enjoy the winter season, but be sure to take care of your skin to avoid the damage the cold season can cause.

The first organization in the U.S committed to educating the public and medical professionals about sun safety, The Skin Cancer Foundation is still the only global organization solely devoted to the prevention, detection and treatment of skin cancer. The mission of the Foundation is to decrease the incidence of skin cancer through public and professional education and research.