longstanding plantar skin “rash”

I’d appreciate your thoughts on the attached rash 86 year old, female with an approx 2yr history of this problem Has diabetes and osteoarthritis, not the easiest client to get a history from.

I’d appreciate your thoughts on the attached rash 86 year old, female with an approx 2yr history of this problem Has diabetes and osteoarthritis, not the easiest client to get a history from.

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longstanding plantar skin “rash”