What are the common symptoms of seborrheic dermatitis?

Seborrheic dermatitis common symptoms are: 1, the incidence of the site is in some sebum secretion strong position, such as scalp, external auditory canal, ear, eyebrow arch, nasal both sides, mandible and chest back parts. 2, divided into two types, the first is dry type, manifested in erythema, and then will show a lot of small desquamation, skin performance is dry, there will be slight itching; The second type is called scab type, which is a greasy seborrheic discharge followed by yellow scabs and mild itching.