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It is time to celebrate the 4TH of July with some fun in the sun…but don’t forget to protect your skin! A little awareness and some precautions can go a long way to make this holiday weekend safer!

Despite the fact that we have limited exposure to sunny days in NEPA (50%), skin cancer still exists in large numbers. Skin cancer is the most common cause of cancer in the United States. While there are several types of skin cancer and not necessarily all are deadly, procedures to remove these skin cancers are both costly and frequently result in unsightly scars. The most dangerous type of skin cancer, called melanoma, results in an estimated 10,000 deaths per year. The good news? Nearly all skin cancers are preventable!

UV rays and Skin Cancer

The majority of skin cancers are caused by harmful ultraviolet (UV) rays from the sun. Two major types are UVA and UVB:


In the field of anti-aging, advertisers make lofty promises for many products that claim to contain or boost collagen. Whether or not these work is a whole other discussion, but what is collagen and what does it have to do with wrinkles?

Collagen is the most abundant protein in the human body. It is found in nearly all tissues and organs, and plays a crucial role in maintaining structural integrity. Unfortunately, collagen production naturally decreases with age. This causes many of the findings we associate with older age, such as sagging skin and wrinkles, as well as joint pain. Collagen also works together with another important protein called elastin, which helps to maintain elasticity – a feature commonly associated with youthful skin.

When exposed to UV rays, these proteins can become damaged. For instance, studies have shown that skin exposed to UV rays increases the expression of proteins called matrix metalloproteinases, or MMPs. You can think of these MMPs as collagen’s enemy, as they cause their degradation. This results in a decrease in collagen’s structural function leading to loose and wrinkled skin. UV rays can also stimulate the production of reactive oxygen species. These are substances such as hydrogen peroxide and bleach, which further cause destruction of skin’s microscopic structure.

Sunscreen Tips & Tricks

So, you’re convinced and have decided to keep your skin healthy and youthful – what next? With so many different products on the market, choosing a daily sunscreen can become a difficult task. Here are a few pointers:

Sunscreen – Chemical vs. Physical Blockers

Another consideration when choosing a sunscreen is chemical versus physical blockers:

If preventing skin cancer isn’t incentive enough to wear sunscreen daily and avoid excessive sun exposure (and indoor tanning booths!), then consider the rapid effects on aging the sun’s rays can have. While a tan may look good for a week, avoiding exposure to UV rays will both delay and prevent aging for years.

For more information on skin cancer and prevention, please visit the Center for Disease Control’s website ( and contact your physician for specific concerns regarding spots on your skin.

Guest Contributor: Eduardo Ortiz, MD, Geisinger Commonwealth School of Medicine 2018

NEXT WEEK! Read Dr. Mackarey’s Health & Exercise Forum – every Monday. This article is not intended as a substitute for medical treatment. If you have questions related to your medical condition, please contact your family physician. For further inquires related to this topic email:

Paul J. Mackarey PT, DHSc, OCS is a Doctor in Health Sciences specializing in orthopedic and sports physical therapy. Dr. Mackarey is in private practice and is an associate professor of clinical medicine at Geisinger Commonwealth School of Medicine. For all of Dr. Mackarey's Articles. check out our exercise forum!