Melanin's primary functions in the skin include providing protection against ultraviolet (UV) radiation, determining skin color, and contributing to skin tone. It acts as a natural sunscreen by absorbing UV rays, which helps in preventing DNA damage that can lead to skin cancer. The presence of melanin in varying amounts results in the diverse range of skin tones seen in individuals, making it a crucial factor in pigmentation.
Absorbing moisture, however, is not a function associated with melanin. Instead, melanin is primarily focused on pigmentation and UV protection. Moisture absorption in the skin is largely attributed to other components, such as hyaluronic acid and natural oils, which help maintain skin hydration. Therefore, identifying moisture absorption as a function of melanin is incorrect.