This could be an autoimmune vasculitis which causes leakage of red blood cells out of tiny blood vessels in the skin. I wouldn't expect itching as you'd often experience with allergic reactions. Have your rheumatologist examine and advise you. Appropriate testing such as a cbc& diff with a platelet count,pro time,ptt,lupus anticoagulant for example or you may be referred to a dermatologist.
Answered 2/10/2023
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