Question:hard
A child has a lesion on the buttocks for 2 years, spreading peripherally with central scarring and non symptomatic. The diagnosis is?
A child has a lesion on the buttocks for 2 years, spreading peripherally with central scarring and non symptomatic. The diagnosis is?
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A chronic, asymptomatic ring that clears centrally and creeps outward slowly.
Updated On: Jun 24, 2026
- Erythema annulare centrifugum
- Erythema migrans
- Erythema marginatum
- Erythema gyratum repens
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Focus on the description, a ring shaped lesion that creeps outward while healing in the centre, present for two years and causing no symptoms. This slow, ring forming, quiet eruption is the hallmark of erythema annulare centrifugum, which advances only a few millimetres a day.
Step 2: Compare the other rings. The lesion of erythema migrans accompanies a tick bite and Lyme disease and is not a chronic buttock plaque. Erythema gyratum repens moves quickly in a striking grained pattern and signals an internal cancer, neither of which matches a benign two year course.
Step 3: Erythema marginatum belongs to rheumatic fever and appears with cardiac or joint disease, not as an isolated chronic skin ring. Eliminating these leaves the centrifugally enlarging, centrally clearing, asymptomatic lesion, which is erythema annulare centrifugum.
\[\boxed{\text{Erythema annulare centrifugum}}\]
Step 2: Compare the other rings. The lesion of erythema migrans accompanies a tick bite and Lyme disease and is not a chronic buttock plaque. Erythema gyratum repens moves quickly in a striking grained pattern and signals an internal cancer, neither of which matches a benign two year course.
Step 3: Erythema marginatum belongs to rheumatic fever and appears with cardiac or joint disease, not as an isolated chronic skin ring. Eliminating these leaves the centrifugally enlarging, centrally clearing, asymptomatic lesion, which is erythema annulare centrifugum.
\[\boxed{\text{Erythema annulare centrifugum}}\]
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