It is often the result of an exacerbation of unstable plaque psoriasis, particularly following the abrupt withdrawal of systemic glucocorticoids. This form of psoriasis can be fatal as the extreme inflammation and exfoliation disrupt the bodys ability to regulate temperature and perform barrier functions. 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. When psoriasis involves the oral mucosa (the lining of the mouth), it may be asymptomatic, but it may appear as white or grey-yellow plaques. Fissured tongue is the most common finding in those with oral psoriasis and has been reported to occur in 6.5–20% of people with psoriasis affecting the skin. The microscopic appearance of oral mucosa affected by geographic tongue (migratory stomatitis) is very similar to the appearance of psoriasis. However, modern studies have failed to demonstrate any link between the two conditions. Seborrheic-like psoriasis
Seborrheic-like psoriasis is a common form of psoriasis with clinical aspects of psoriasis and seborrheic dermatitis, and it may be difficult to distinguish from the latter. This form of psoriasis typically manifests as red plaques with greasy scales in areas of higher sebum production such as the scalp, forehead, skin folds next to the nose, the skin surrounding the mouth, skin on the chest above the sternum, and in skin folds. Psoriatic arthritis
Psoriatic arthritis is a form of chronic inflammatory arthritis that has a highly variable clinical presentation and frequently occurs in association with skin and nail psoriasis.
Cutaneous endometriosis is characterized by the appearance of papules at the umbilicus or in lower abdominal scars after gynecologic surgery in middle-aged women. : 628  The size averages to 2 cm in diameter. Its colour ranges from blue to violet, brown or skin-coloured.Rarely, endometriosis may present inside the muscles of the abdominal wall instead of the skin after caesarean section. See also
Endometriosis
Skin lesion


== References ==