I hate that itchy feeling, and the red spots hurt!
Your doctor can give you a prescription for Nizoral 2% (It's kind of pricy, about $35 a bottle, but if you have prescription coverage, it should cover it.) You leave it on for five minutes and then wash it out. I used that once a week for a couple of months, and then use over the counter Nizoral in between, once a week also. It deals with the fungus (I think that's what it was, like sebbhorea). I shampoo twice every time I wash my hair. I use the Nizoral OVTC (1%) when I shampoo (even now) for one shampoo, and a good shampoo (non drying, high protein for strength) for the second. I use a leave in conditioner.