What is the Reason for black patch on the forehead?

A black patch on the forehead can be caused by various factors including hyperpigmentation, which occurs due to excess melanin production from sun exposure, hormonal changes, or skin conditions like melasma. Other potential reasons include the presence of moles or skin tags, post-inflammatory hyperpigmentation from previous injuries or acne, or certain dermatological disorders. It's advisable to consult a dermatologist for a proper diagnosis and treatment options if concerned.