Psoriasis is an obstinate skin condition in which red patches of various sizes develop on the skin that is covered with dry, silvery scales. Psoriasis is a chronic skin disease that got its name from the Greek word meaning, 'itch'.
In psoriasis the skin becomes inflamed and red eruptions appear on the surface of the skin that begins to itch excessively. These areas form thickened areas (plaques) that are covered with silvery scales over the reddened lesions. The skin at the joints may crack.
The diagnosis of psoriasis is usually clinical which means that the doctors would diagnose psoriasis after a careful examination of the skin. The white silvery scales of psoriasis are very distinctive and guiding feature for diagnosis. Also, consideration of the history, family history, the spread on affected areas, etc. is taken into account to conclude the diagnosis of psoriasis. In cases of doubt, the doctor may ask the patient to do skin biopsy that means examining a small skin sample under a microscope. However, this is not a routine practice.
The most common causes of recurring ulcers in mouth can be summarized as under:
The head is covered with a thick, leather-like crust, under which thick and white pus collects here and there, and the hair is glued together.