Forehead spots may be related to sunlight exposure, congenital factors, gynecological diseases and skin aging. 1. Sunlight exposure: people who do too much outdoor exercise are exposed to ultraviolet rays for a long time, which can cause sun spots and lead to forehead spots. 2. Congenital factors: some people with forehead spots are related to hereditary factors, including pigmented nevus, nevus of Ota and coffee spots. 3. Gynecological diseases: it may cause chloasma, which usually shows irregular dark brown spots. 4. Skin aging: as you age, a deeper pigmented patch called age spot will form because of skin aging. There are many reasons for spots on forehead, which may be related to freckles, and you should go to the hospital for examination if you want to know the reasons.