Are you taking any new medications, or have you ingested anything new/unusual? It could be an allergic reaction to some to intake.
I don't associate your condition with anything to do with Heart Rhythm issues, but I have read that some heart drugs can cause an allergic reaction and such a side effect needs to be immediately discussed with the doctor prescribing the medication.
Petechiae or allergic reaction perhaps? If you do a quick search, you will find images of petechiae. In any case, it might be best to contact your doctor.