Do not worry: An isolated petechial rash on the left breast most likely represents local irritation from your bra or clothing. Are you wearing any new bras? Do they feel tight? Have you taken up a new exercise program or jogging? If the petechial rash starts to involve other parts of your body or if you have any bruising you need to have a blood count done by your internist. Your platelet count could be low.
Answered 12/18/2020
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