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Solitary red patches – 17 cases

One is often faced with a solitary red patch of skin to diagnose. Some clues to differentiate the most common conditions are presented in this quiz.

It is particularly important to identify malignant tumours.

For each of the seventeen 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 2 minutes to complete. There is a list of suggested further reading material at the end of the quiz.

Case 2

Squamous cell carcinoma in situ with dermoscopic view

Squamous cell carcinoma in is also slowly growing and irregular in shape, but with more crust or scale. It most often occurs on face or distal limbs. It tends to be orange-red. There is no shiny rim of stretching. Use the dermatoscope to identify irregular clusters of globular or glomerular vessels.

Mark question

See smartphone apps to check your skin.
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