Erythema annulare Centrifugum

Question 1

Peak age of onset for erythema annulare centrifugum:

Answer 1

50

Question 2

Pathogenesis of erythema annulare centrifugum:

Answer 2

unknown (maybe injections)

Question 3

clinical presentation of erythema annulare centrifugum:

Answer 3

starts as pink papule→erythematous annular lesions that migrate centrifugally (up to 6cm in 2 weeks)

• trailing scale
• most commonly on thighs/hips

Question 4

Histopathology of erythema annulare centrifugum:

Answer 4

mild spongiosis, focal PK

• perivascular lymphohistiocytic infiltration with coat sleeve appearance around vessels (very dense, tightly hugging vessels)

Question 5

Treatment and prognosis of erythema annulare centrifugum:

Answer 5

Treat underlying infection if present, or topical steroids

• lesions last days to months