Ringworm is the most common cause of a circular rash on the skin, but other issues—such as Lyme disease and granuloma annulare—can also cause this distinctive mark. A doctor diagnoses the cause of a ...
Some people may experience a rash on their injection arm after getting the Moderna COVID-19 vaccine. The rash is likely a delayed allergic reaction or hypersensitivity. Experts say there's no need to ...
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