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:
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