How does UVA light affect already existing melanin in the skin?

UVA light primarily affects already existing melanin in the skin by turning it brown, which results in the development of a tan. This process occurs because UVA rays penetrate the skin more deeply than UVB rays and cause the melanin already present in the skin to oxidize. When melanin oxidizes, it darkens, contributing to the tanning effect that people seek when using tanning beds or sunbathing.

This response from the skin to UVA light is part of the body's natural defense mechanism against damage from ultraviolet radiation. By producing and darkening melanin, the skin is attempting to protect itself from potential harm caused by UV exposure.

Understanding this mechanism is crucial for those working in tanning environments, as it highlights the importance of educating clients about safe tanning practices and the role sun exposure plays in skin health.