potency manifestations psoriasis hydrocortisone arthritis autoimmune patients lichen oral chronicus autoimmune requiring trigger recur hypothyroidism vitiligo mellitus psoriasis replacement diabetes past years psoriasis vitiligo disease autoimmune graves requiring systemic documented dermatitis atopic cohort skin exfoliative epidermis patients disrupts psoriasis subjects deteriorate hypo hyperthyroid autoimmune psoriasis vitiligo disease diabetes type requiring