5) Melasma and its Treatment by Retinol
Another skin condition called melasma causes dark patches or spots on the areas of skin exposed to the sun. Exposure to light and heat produces more melanin, resulting in these flat, freckle-like spots of light or dark brown skin.
Melasma most frequently occurs during pregnancy. See your healthcare professional before using topical, oral, or dietary supplements during pregnancy. Tretinoin, a retinoid, can help fade melasma spots if you are not having a pregnancy.