I've always had dandruff which was under control but has come back again. also returned are crazy itchy, clumps of hard skin on the crown of my scalp?

Serious Rx: You have acne that's being managed aggressively, which is good, and probably also have seborrheic dermatitis. Your personal physician or a dermatology specialist can advise about the use of antifungals and other agents for this tricky illness.

See a dermatologist: Psoriasis. Seborrheic dermatitis, other? Start with a precise diagnosis. Meanwhile use a dandruff shampoo daily: zinc pyrethione, selenium sulfide, salycilic acid, ketoconazole, tar. Any of these are commonly found otc.