I have seborrheic dermatitis on my scalp & ears. I've also been having issues with dry, flaky, peeling, itchy, irritated, sometimes red and burning skin in butt crack.

Seb derm areas. Seborrheic dermatitis can affect the scalp, face, chest, back, underarms, groin and lower abdomen, and the fold between the buttocks. Psoriasis can do the same thing. In mild cases of both treatments are similar. Care must be taken not to use steroid creams in body folds for prolonged periods of time as they can thin the skin and cause other damage.