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. Lead-in Question: 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

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