The type of melanin the body produces depends on a gene called MC1R. ![]() Eumelanin protects the skin from UV rays, but pheomelanin does not. The body can produce two types of melanin called pheomelanin and eumelanin. Genetics also play a leading role in who is more likely to develop freckles based on which type of melanin their body produces. Freckles often fade or disappear in the winter months, when new skin cells replace old cells.įreckles develop on areas often exposed to sunlight, such as the: This is why freckles tend to appear after sun exposure.įreckles can appear over a large area of skin and can reappear or become darker in the summer months. Sun exposure and genetic factors make some people more likely to develop freckles: Sun exposureĪ person’s skin cells produce extra melanin to protect the skin from sun damage. ![]() Freckles appear when melanin, the pigment that gives skin its color, builds up under the skin.
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