MEDICAL DIARY - The Federation of Medical Societies of Hong Kong

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Dermatological Quiz
Dermatological Quiz
Dr. Lai-yin Chong
MBBS(HK), FRCP(Lond, Edin, Glasg), FHKCP, FHKAM(Med)
Yaumatei Dermatology Clinic, Social Hygiene Service
Fig 1: Annular erythematous eruption at
right thigh
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VOL.14 NO.1 JANUARY 2009
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A 30-year-old woman complained of non-pruritic skin lesions
over her thighs and abdomen. The individual lesion spread
rapidly to a large size within 1-2 weeks (Figure 1). There were
no associated systemic symptoms. Her past health was good.
On physical examination, there were figurate erythematous
lesions over thighs and abdomen. The lesion at right thigh was
annular with elevated edge and central clearing. There was
absence of scaling.
Questions:
Dr. Lai-yin Chong
1. What is your preliminary diagnosis and what are the four
classic figurate erythemas?
2. How do you reach the diagnosis in this lady?
3. What investigations will you perform?
4. What will be your treatments?
(See P.41 for answers)