An elderly old age home resident with generalised pruritic rashes for over one year
Audrey YY Yau, Adrian KC Cheng
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Clinical history:
An 86-year-old man, a resident of an old age home, presented with generalised pruritic rash over his trunk and bilateral upper and lower limbs for over one year. His previous treatments include 2 courses of topical permethrin 5% lotion and intermittent topical corticosteroids, with minimal sustained improvement. On examination, the forearms and dorsum of hands showed ill-defined erythematous patches with excoriations. A characteristic sign was noted over his right thenar eminence, which became more conspicuous on dermoscopic examination.
What is the diagnosis?


| A. | Scabies |
| B. | Allergic contact dermatitis |
| C. | Asteatotic eczema |
| D. | Dermatomyositis |
The slide and the question were prepared by:
Miss. Audrey YY Yau
Year 5 Medical Student,
The University of Hong Kong
Dr. Adrian KC Cheng, MBBS(HK), MRCP(UK), MSc GEOR (CUHK), FHKCP, FHKAM (Medicine)
Specialist in Dermatology & Venereology;
Associate Consultant,