Pili annulati
Overview
Pili annulati: A rare hair disorder where some or all of the hair shafts have alternating light and dark bands of color along the hair shaft.
Symptoms
Asymptomatic Light bands on hair shaft Dark bands on hair shaft Fragile hair
Causes
Alopecia areata Alopecia areata is usually marked by well-circumscribed patches of nonscarring hair loss on the scalp without skin changes. Occasionally, the patches also appear on the beard, axillae, pubic area, arms, legs, or the entire body (alopecia universalis). “Exclamation point” hairs—loose hairs with rough, brushlike tips on narrow, less-pigmented shafts—typically border expanding patches of alopecia. Although this disorder is recurrent, hair growth usually returns after several months. In about 20% of patients, alopecia areata also causes horizontal or vertical nail pitting. TopArsenic poisoning Most common in chronic poisoning, alopecia is diffuse and mainly affects the scalp. Related signs and symptoms include muscle weakness and wasting, areflexia, partial or total vision loss, and bronze skin. TopArterial insufficiency Patchy alopecia occurs in arterial insufficiency, typically on the lower extremities, and is accompanied by thin, shiny, atrophic skin and thickened nails. The skin turns pale when the patient’s legs are elevated and dusky when they’re dependent. Associated findings include weak or absent peripheral pulses, cool extremities, paresthesia, leg ulcers, and intermittent claudication. TopBurns Full-thickness or third-degree burns completely destroy the dermis and epidermis, leaving translucent, charred, or ulcerated skin. Scarring or keloid formation associated with these burns causes permanent alopecia.
Prognosis
The 'prognosis' of Pili annulati usually refers to the likely outcome of Pili annulati. The prognosis of Pili annulati may include the duration of Pili annulati, chances of complications of Pili annulati, probable outcomes, prospects for recovery, recovery period for Pili annulati, survival rates, death rates, and other outcome possibilities in the overall prognosis of Pili annulati. Naturally, such forecast issues are by their nature unpredictable.