Psoriasis
Psoriasis is a common skin condition that speeds up the life cycle of skin cells. It causes cells to build up rapidly on the surface of the skin.
Signs And Symptoms
Plaque psoriasis
Psoriasis vulgaris (also known as chronic stationary psoriasis or plaque-like psoriasis) is the most common form and affects 85%–90% of people with psoriasis.
Pustular psoriasis
Pustular psoriasis appears as raised bumps filled with noninfectious pus (pustules). The skin under and surrounding the pustules is red and tender.
Inverse psoriasis
Inverse psoriasis (also known as flexural psoriasis) appears as smooth, inflamed patches of skin.
Napkin psoriasis
Napkin psoriasis is a subtype of psoriasis common in infants characterized by red papules with silver scale in the diaper area that may extend to the torso or limbs.
Guttate psoriasis
Guttate psoriasis is characterized by numerous small, scaly, red or pink, droplet-like lesions (papules).
Mouth
Psoriasis in the mouth is very rare, in contrast to lichen planus, another common papulosquamous disorder that commonly involves both the skin and mouth.
Causes
The cause of psoriasis is not fully understood, but a number of theories exist.