An 8-month-old boy is brought in by his mother for concerns of a rash that comes and goes for the last few months, primarily on his face and belly. His older brother suffers from asthma and often has a similar rash on the inside of his elbow and behind his knees.

The gene most commonly mutated in the photograph is also mutated in which of the following?

A.) Palmoplantar keratoderma
B.) Erythrokeratoderma variabilis
C.) Pemphigus vulgaris
D.) Ichthyosis vulgaris
E.) Monilethrix

To find out the correct answer and read the explanation, click here. 

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