A 35-year-old woman is referred for a brown plaque on the upper back that has slowly enlarged over nine years. It was initially flat, but several firm reddish-brown lumps have appeared within it during the past year. There is no history of vaccination, surgery or penetrating injury at the site. The plaque is fixed to the skin but moves over the underlying muscle. Which one of the following is the most likely diagnosis?
Keep going — a set of ten like this one, one at a time.
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