I am very sure what you have is "seborrheic dermatitis
". The good news is that it is easy to treat. You will need to go to the drug store and buy a shampoo that treats it, such as; T-gel, Selsun Blue, or Denorex. If you cannot find one of these, ask the pharmacist for one that treats seborrheic dermatitis
(these do not require a prescription). You will usually feel your scalp tingling when you use the shampoo so don't let that scare you.