Allergic contact dermatitis (ACD) to a neoprene-containing knee brace. Note the rash at the site of contact over the left knee, but a systemic reaction elsewhere (see additional photos below as well).
Allergic Contact Dermatitis to Neoprene

Additional Pictures

Allergic Contact Dermatitis to Neoprene Allergic Contact Dermatitis to Neoprene

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