<unk>  is a chronic and relapsing disease
Often begins in the 2nd or 3rd decade of life
Plaque: also known as<unk>  vulgaris, makes up about 90% of cases. It typically presents as red patches with white scales on top. Areas of the body most commonly affected are the back of the forearms, shins, navel area, and scalp.
Guttate: drop-shaped lesions.
Inverse: red patches in skin folds
Pustular: presents as small non-infectious pus-filled blisters
Erythrodermic: occurs when the rash becomes very widespread, and can develop from any of the other types. Fingernails and toenails are affected in most people with<unk>  at some point in time. This may include pits in the nails or changes in nail color.
Stress
Trauma
Drugs: NSAIDs, B-blockers
Psoriasis
Acute generalized exanthematous pustulosis
Vitiligo
Allergic reaction
Lichen planus
Aphthous stomatitis
Tinea corporis
Atopic dermatitis