Quiz
Yellow skin conditions – 12 cases

Cutaneous spots and blotches may be yellow because of endogenous or exogenous pigment (xanthochromia), or because of a thick layer of keratin of lipid.

For each of the twelve 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 4

What is the diagnosis?

Congenital plantar keratoderma

What causes the yellow hue in the skin in this condition?

Thick keratin may appear yellow, hence the yellow colour of congenital and acquired palmoplantar keratoderma.

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