It can occur in widespread patches or on small areas of the palms or soles. Pustular psoriasis, a rare type, causes clearly defined pus-filled blisters. Fungal infections may trigger this type of psoriasis. It causes smooth patches of inflamed skin that worsen with friction and sweating. Inverse psoriasis mainly affects the skin folds of the groin, buttocks and breasts. It's marked by small, drop-shaped, scaling spots on the trunk, arms or legs. It's usually triggered by a bacterial infection such as strep throat. Guttate psoriasis primarily affects young adults and children.

Severe disease may cause the nail to crumble. Psoriatic nails might loosen and separate from the nail bed (onycholysis). Psoriasis can affect fingernails and toenails, causing pitting, abnormal nail growth and discoloration. The affected skin might heal with temporary changes in color (post inflammatory hyperpigmentation), particularly on brown or Black skin. The patches vary in color, depending on skin color. They usually appear on the elbows, knees, lower back and scalp. The most common type of psoriasis, plaque psoriasis causes dry, itchy, raised skin patches (plaques) covered with scales. There are several types of psoriasis, each of which varies in its signs and symptoms: Cyclic rashes that flare for a few weeks or months and then subside.Small scaling spots (commonly seen in children).Rashes that vary in color, tending to be shades of purple with gray scale on brown or Black skin and pink or red with silver scale on white skin.A patchy rash that varies widely in how it looks from person to person, ranging from spots of dandruff-like scaling to major eruptions over much of the body.The least common type of psoriasis, erythrodermic psoriasis can cover the entire body with a peeling, itchy rash.Ĭommon signs and symptoms of psoriasis include:

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