Psychodermatology is the study and practice of the relation between skin disorders and psychological aspects. Many skin disorders ultimately have an underlying emotional reasons that cause them. The skin is our shell, it delimits us from the outside world, and so sometimes psychological problems are believed to be "expressed" trough our skin.
Psychodermatologists specialize in treating skin disorders using psychiatry and psychotherapy. Skin picking related disorders can also be treated by a Psychodermatologist.