There is no direct known cause, but possible causes are presumed to be hormonal changes, and yeast
/ fungal infections. The best way to treat this scalp
condition is by using medicated shampoos (salicylic acid, selenium sulfide, zinc pyrithione, coal tar) , along with a good clarifying shampoo. Additional home remedies include apple-cider vinegar, fresh lemon juice, baking soda, and dish detergent. I also recommend Diflucan (anti-fungal) pills.