Don't worry...you are suffering from seborrheic dermatitis causing dandruff... Medicine available for good control... Treatment depends on the severity..Do direct online consultation for detailed prescription by sending photos.

Dandruff can be cleared by using anti dandruff shampoos, lotions. It's good to take head bath three times a week. If can be controlled... It is not related with PCOS....

Dandruff Follow these practices to keep your scalp clean and healthy- 1. wash hair every alternate day- from root to tip. 2. Use a hair oil 1 hour before shampoo. 3. Dont rub your hair vigorously, gently pat dry.  4. use a conditioner if hair are frizzy.  If Your dandruff stays even after these practices, consult a dermatologist. The doctor will check if its normal dandruff or seborrhoeic dermatitis or psoriasis of scalp and accordingly you will be prescribed the medication required.

Well you needs to stop your habit of touching scalp. Also may be your scalp is oily and u may need to shampoo it frequently. Any further assistance take an online consultation with practo.