Blackheads are small, dark spots that appear on the skin, often on the face, especially around the nose and chin. They form when hair follicles become clogged with excess oil, dead skin cells, and bacteria. Unlike whiteheads, which are closed and appear white, blackheads are open at the surface, allowing the trapped material to oxidize and turn dark. To prevent blackheads, it's important to maintain a regular skincare routine that includes cleansing and exfoliating. Using products with ingredients like salicylic acid can help keep pores clear. Regular visits to a dermatologist can also provide effective treatments for stubborn blackheads.