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.
What is the diagnosis?
What causes the yellow hue in the skin in this condition?
