That may help with dry, crusty patches. If none of that works ... for topical treatments that can help. Any rash or sores on your scalp may scab over. They may become infected, too.

So, if your scalp comes into contact with a product or ingredient that you're sensitive or allergic to, you can experience inflamed, itchy, sore red patches, says Massick. Picking these patches ...

Scalp care—or more specifically ... exfoliators like salicylic acid and glycolic acid—great for breaking down crusty flakes, excess oil, product buildup, and dead skin cells that your usual ...