Blackheads are usually caused by blocked pores due to excess oil, sweat, or cosmetic products. Wash your face twice daily with a gentle cleanser and consider using products containing salicylic acid or adapalene to help clear clogged pores and reduce blackheads. Avoid heavy or oily creams and keep hair products away from the forehead area, as they may contribute to blockage. If the problem persists, a doctor can prescribe a topical retinoid to help prevent new blackheads and improve skin texture.