Psoriasis is a long-lasting autoimmune disease characterized by patches of abnormal skin

Pemphigoid is a group of rare autoimmune blistering skin diseases. Pemphigoid is similar in general appearance to pemphigus.

Pemphigus vulgaris is a rare chronic blistering skin disease and the most common form of pemphigus.

Pityriasis rosea is a type of skin rash. Classically, it begins with a single red and slightly scaly area known as a "herald patch".

Pityriasis lichenoides chronica is an uncommon, idiopathic, acquired dermatosis.

Pyogenic granuloma or pyogenic fibroma is a vascular tumor that occurs on both mucosa and skin.

Panniculitis is a group of diseases whose hallmark is inflammation of subcutaneous adipose tissue.

Pyoderma gangrenosum is a rare, inflammatory skin disease where painful pustules or nodules become ulcers that progressively grow.