Quiz
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 5

Name this red-coloured skin lesion.

Porokeratosis with dermoscopic view

Describe its characteristics

Porokeratosis refers to a round or irregularly shaped patch with a scaly rim and a smooth featureless centre. A large solitary plaque may occur (porokeratosis of Mibelli), but multiple small (5 – 15 mm) patches on distal limbs are more common (disseminated superficial actinic porokeratosis).

Mark question

Previous Question Next Question