Pimples on the forehead, neck, and shoulders are often due to excess oil, sweat, clogged pores, or dandruff from the scalp, and can be worsened by tight clothing or oily hair products. Keep the area clean by using a gentle or salicylic acid/benzoyl peroxide?based cleanser, shower after sweating, and avoid applying oily creams or hair products on these areas. Wear loose, breathable clothing and keep your hair and scalp clean. Try not to pick or squeeze the pimples, as this can lead to marks. If the problem is persistent or severe, consult a dermatologist for proper treatment to prevent scarring.