A chronic inflammatory skin disease; it is related to inherited genes and the immune system. Ailments like obesity, diabetes and heart diseases are more common in people with psoriasis. Symptoms and signs of psoriasis include red, scaling plaques of itchy, elevated skin affecting the elbows, knees and the scalp. Psoriasis is not contagious and certain environmental triggers can flare up the condition further. It cannot be cured but controlled with proper medication.