Can psoriasis be diagnosed from pictures?

Pictures are not stated as a method of diagnosis for psoriasis, according to Mayo Clinic. Health care providers normally evaluate medical history and examine a patient’s nails, scalp and skin to diagnose psoriasis. In some cases, doctors perform a skin biopsy to rule out other disorders.

Psoriasis is a chronic skin disorder, reports MedicineNet. Pink or red bumps unite into patches of raised and itchy skin. Although psoriasis may appear on any body part, it typically affects the elbows, knees and scalp. The condition may clear up or worsen sporadically. Several conditions may mimic psoriasis, including lichen planus, pityriasis rosea, ringworm and seborrheic dermatitis, states Mayo Clinic.