White Knuckles

Chalk these lesions up to trauma?

The mother of a 10-year-old boy brings him in for evaluation of his moles (which are all benign). During the visit, the mother asks about the lesions on the first 2 knuckles of his right hand; she initially noticed them several months earlier. The boy is otherwise healthy.

What is your clinical impression?

Warts
Psoriasis
Lichen planus
Dermatomyositis
Trauma
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