June 2020 | Case of the Month

History

A 37 year old presented with an 8 month history of a gradually expanding asymptomatic lesion on his lower abdomen that had not responded to potent topical steroids. There was no other skin history and the patient was otherwise well.


Examination

A solitary smooth white plaque with surrounding erythema. 


Investigations

What important question and aspect of examination I have not alluded to? What is the differential? 


Images

Diagnosis

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There is quite a long differential of white patches/plaques as per the diagnostic table.

Given the inflammation the differential included morphoea, inflammatory vitiligo, sarcoid (one of the great mimickers), and tuberculoid leprosy - the important questions where that of foreign travel and was the lesion anaesthetic? The answers were both no, which would very much point away from leprosy.

A biopsy confirmed the diagnosis of inflammatory vitiligo, Inflammatory vitiligo with raised borders (IVRB) is a rare subtype of vitiligo described as having a rim of raised erythema at the periphery of the depigmented patches. The aetiology is poorly understood, and there are few reports of successful treatment. 

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