Sunscreen applied at 2 mg cm 2 during a sunny holiday prevents erythema, a biomarker of ultraviolet radiation induced DNA damage and suppression of acquired immunity
Sun protection factor (SPF) is assessed with sunscreen applied at 2 mg cm 2. People typically apply around 0*8 mg cm 2 and use sunscreen daily for holidays. Such use results in erythema, which is a risk factor for skin cancer.
The British journal of dermatology