Professional and Linguistic Assessments Board (PLAB) Practice Exam

What characterizes necrobiosis lipoidica?

1. Painless lesions on the face

2. Yellow/red shiny areas on the legs

3. Scaly patches on the scalp

4. Widespread rashes on the body

The correct answer is: Yellow/red shiny areas on the legs

Necrobiosis lipoidica is characterized by yellow or red shiny areas, primarily occurring on the lower legs. This condition typically presents as well-defined plaques with a smooth, waxy surface, which may be slightly raised. The underlying issue often relates to problems with the small blood vessels and can be associated with diabetes mellitus, though it can also occur in individuals without diabetes. The lesions may not be painful, but they can sometimes be itchy or tender. The significant aspect here is the specific appearance and location of the lesions – they predominantly present on the legs and have a unique yellow or reddish coloration that distinguishes them from other skin conditions. In contrast, the other options describe different skin conditions or rashes that do not match the characteristic presentation of necrobiosis lipoidica. For instance, lesions on the face or widespread rashes do not align with the classic presentation, and scaly patches typically refer to other dermatological conditions like psoriasis or eczema rather than necrobiosis lipoidica.