5 days ago i was bitten by a bug. the area had 2 large, itchy lumps. after three days, the swelling and itchiness went down significantly. i went to a doctor and they just said to keep it clean and apply hydrocortisone cream. however it is now a dark purple color, 5 days later. again, it doesn't hurt and is a lot less itchy. is this purple bruising from the bite or should i see a doctor immediately?