
it could be seborrheic dermatitis. I suffer with this and the only shampoo I can use regularly is moo goo milk shampoo. This is the only product I can use on my hair without getting another flair up. It takes a couple of weeks before the problem clears up though. I can usually get it from my local pharmacy, but if not I can order it from moogooskincare. I literally tried every type of shampoo and this was the only thing that worked for me.
It can spread to your eyebrows and ears. If it gets in your ears try otomize ear spray.
You may be allergic to a preservative that is added to shampoos, conditioners, shower/bath gel, creams and laundry detergents or conditioners called methylisothiazolinone or in fact any preservative ending in zolinone. check out the ingredient lists to all of the above products to see. About 10% of people are allergic to these preservatives and can present with skin and/or breathing conditions as a result.