Questions? Contact us on 020 3962 2083

Skin cancer and sunscreen

As a medical doctor, I have witnessed firsthand the profound impact that skin cancer can have on individuals and their families. One of the most effective ways to prevent this potentially deadly disease is also one of the simplest: regular and proper use of sunscreen. In this blog post, I will explain why sunscreen is vital for your skin health and how it can significantly reduce your risk of developing skin cancer.

Doctor smiling

Understanding Skin Cancer

Skin cancer is the most common type of cancer worldwide. It primarily arises from excessive exposure to ultraviolet (UV) radiation, which comes from the sun and artificial sources like tanning beds. The three main types of skin cancer are:

1. Basal Cell Carcinoma (BCC): The most common type, usually appearing on sun-exposed areas such as the face and neck. While it grows slowly and rarely spreads, it can cause significant local damage if left untreated.

2. Squamous Cell Carcinoma (SCC): Often found on sun-exposed areas, SCC can grow more quickly than BCC and has a higher likelihood of spreading to other parts of the body if not treated early.

3. Melanoma: The most dangerous form of skin cancer, melanoma can develop anywhere on the body. It has a high tendency to spread to other organs and can be deadly if not caught early.

How Sunscreen Protects Your Skin

Sunscreen acts as a protective barrier, absorbing or reflecting harmful UV rays. There are two types of UV radiation that contribute to skin damage and cancer:

UVA Rays: Penetrate deeply into the skin, causing aging and long-term damage. They play a significant role in the development of skin cancer.

UVB Rays: Cause sunburn and are directly linked to the development of skin cancer.

Broad-spectrum sunscreens protect against both UVA and UVB rays. Regular use of sunscreen can prevent the DNA damage that leads to skin cancer and reduce the risk of sunburn, which is a significant risk factor for melanoma.

Choosing the Right Sunscreen

When selecting a sunscreen, consider the following:

1. Broad-Spectrum Protection: Ensure it protects against both UVA and UVB rays.

2. SPF Rating: Choose a sunscreen with an SPF of at least 30. Higher SPFs provide more protection, but no sunscreen can block 100% of UV rays.

3. Water Resistance: If you plan to swim or sweat, opt for a water-resistant sunscreen.

How to Apply Sunscreen Correctly

Proper application is crucial for effective protection:

1. Amount: Use about one ounce (a shot glass full) to cover your entire body.

2. Timing: Apply sunscreen 15-30 minutes before going outside to allow it to bind to your skin.

3. Reapplication: Reapply every two hours, or more often if swimming or sweating.

Additional Sun Safety Tips

While sunscreen is a powerful tool in preventing skin cancer, it should be part of a comprehensive sun protection strategy:

Seek Shade: Especially during peak UV radiation hours (10 a.m. to 4 p.m.).

Wear Protective Clothing: Long sleeves, wide-brimmed hats, and UV-blocking sunglasses can provide additional protection.

Avoid Tanning Beds: They emit harmful UV radiation that significantly increases your risk of skin cancer.


Preventing skin cancer starts with a commitment to sun safety. By incorporating sunscreen into your daily routine, you can protect your skin from harmful UV radiation and significantly reduce your risk of developing skin cancer. As your healthcare provider, I urge you to take these simple yet effective steps to safeguard your skin. Remember, the best sunscreen is the one you use consistently.

Stay safe and protect your skin!

Dr. Daniel