A 66-year-old lady with newly diagnosed diabetes mellitus developed itchy papules and nodules over legs for 2 months
Dr. Adrian KC Cheng
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Clinical history:
A 66-year-old lady with a history of psoriasis and newly diagnosed diabetes mellitus developed these itchy papules and nodules over her legs for 2 months. Examination showed multiple papules and nodules with a raised erythematous rim, surrounding erythema with central keratin plugging. There were post-inflammatory hyperpigmentation on her legs resulting from previous psoriatic plaques. Dermoscopic view of the nodules showed a central hyperkeratotic plug with an elevated erythematous rim. HbA1c was 12%.
What is the diagnosis?
The slide and the question were prepared by:
Dr. Adrian KC Cheng, MBBS(HK), MRCP(UK), MSc GEOR (CUHK), FHKCP, FHKAM (Medicine)
Specialist in Dermatology & Venereology;
Associate Consultant,