Recurrent eruption of the knees and elbows of a 60y old male | Figure 1

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Case Description

Recurrent eruption of the knees and elbows of a 60y old male. It has been appearing and disappearing regularly over a course of 8y. When present the eruption only lasts about 2w. No itch, sometimes painful at the end of the day. Patient is diabetic. No hx of psoriasis. No local treatment so far. Diagnose?

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