Whatever you use, make sure you wash your hair thoroughly in mild shampoo regularly and rinse it off thoroughly - can't emphasise the rinsing enough.
You could try intensively moisturising your scalp for 30 mins or so, then shampooing: slother something like olive oil or a lighter almond oil onto your scalp, work it right into the skin with your fingers then wrap your head in a towel and leave as long as possible - overnight if possible. Shampoo and rinse, repeating several times to get all the oil out.