What are the main differences between psoriasis of the scalp and seborrheic dermatitis? is there a cure for s. dermatitis? why does it happen? ty dr

Seborrheic dermatiti: Seborrheic dermatitis is a common skin disorder that mainly affects your scalp, causing scaly, itchy, red skin and stubborn dandruff. The cause is unknown.Seborrheic dermatitis tends to be chronic, and there's usually no strategy that stops it permanently. But treatments, including many you can try at home, may control your signs and symptoms during a flare-up.See a dermatologist so they can help u.