Sunscreen Myths: Expiration, Skin Cancer – Johns Hopkins
- Skin cancer is the most common cancer in the United States, according to the National Cancer Institute.
- Kavita Patel, a primary care physician at Johns Hopkins Medicine, addresses common misconceptions about sunscreen in a recent Hindustan Times article, clarifying how to best protect your skin...
- A common question is whether sunscreen loses its effectiveness over time.
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Sunscreen Myths Debunked: A Guide to Protecting Your Skin
Table of Contents
Updated as of September 8, 2025
Understanding Sunscreen and Skin Cancer Risk
Skin cancer is the most common cancer in the United States, according to the blank”>Hindustan Times article, clarifying how to best protect your skin from harmful UV rays.
Does Sunscreen Expire?
A common question is whether sunscreen loses its effectiveness over time. The U.S. Food and Drug Management (FDA) requires sunscreen manufacturers to include an expiration date on the label if the product’s stability declines within that timeframe.
Dr. Patel explains that while sunscreen doesn’t necessarily become harmful after the expiration date, its SPF (Sun Protection Factor) may decrease, offering less protection. “If it’s past the expiration date, the SPF may not be as high as it says on the bottle,” she states in the Hindustan Times article.
If a sunscreen doesn’t have an expiration date, the FDA recommends discarding it after three years, or sooner if it has been exposed to extreme heat or direct sunlight for extended periods.
Who is Most at Risk for Skin Cancer?
While anyone can develop skin cancer, certain individuals are at higher risk. These include:
- People with fair skin, light hair, and blue or green eyes.
- Individuals with a family