Psoriasis is a serious skin condition that produces plaques of thickened scaling skin. It is an extremely unpredictable, irritating and persistent skin disease, which can resurface at times. However, the good news is that it is noncontagious in nature. It commonly affects the elbows, knees, scalp, palms, soles of feet and sometimes even the torso, and can even grow to cover large surfaces of the skin.
Causes: Genetic predisposition and environmental factors, defects in immune regulation
Symptoms: Itchy, scaly skin on the scalp, knees and elbows. Psoriasis on the fingernails or toenails can make the nails thick and discoloured
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