Psoriasis is a chronic, inflammatory skin disease. Knees, elbows, scalp, trunk, and nails are the most commonly affected areas. There are several types of psoriasis:
- Plaque—inflamed patches of skin topped with silvery, white scales (most common type)
- Guttate—small, dot-like lesions
- Pustular—weeping lesions and intense scaling
- Inverse (intertriginous)—inflamed patches of skin in body folds (armpits, groin, under breasts)
- Erythrodermic—intense sloughing and inflammation of nearly the entire skin
Copyright © Nucleus Medical Media, Inc.
The cause of psoriasis is unclear. Signals from a defect in the immune system may result in an overgrowth of skin cells. Because the cells grow faster than they can be shed, they pile up on the skin's surface. The excess skin cells are thought to cause the silvery white scales that are characteristic of plaque-type psoriasis.
Last reviewedJanuary 2015by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.