Erythema nodosum: The most likely cause of red spots more likely on lower legs but can occur on the human foot is erythema nodosum. These are really a macular (not raised) and are firm under the skin. Consult your local dermatologist. Cortisone is helpful even cortisone injection.
Answered 5/28/2018
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A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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