Quiz
Mixed diagnoses – 10 cases (10 of 11)

For each of the ten cases, study the image(s) and then answer the questions. You can click on the image to view a larger version if required.

Each case should take approximately five minutes to complete. There is a list of suggested further reading material at the end of the quiz.

When you finish the quiz, you can download a certificate.

Case 4

This patient is concerned by dark marks present in the axillae and groins.

What is this condition?

Erythrasma

What is its cause?

Infection with a gram-positive organism, Corynebacterium minutissimum.

What tests will confirm the diagnosis?

The diagnosis is confirmed by noting coral-red fluorescence on Wood's light (long wave UVA) examination. Microscopy and culture will identify the bacteria responsible, if the laboratory is informed of the clinical suspicion.

How can it be treated?

Erythrasma responds to topical imidazole or fucidic acid creams. Oral erythromycin is also effective.

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