i was bitten on the wrist yesterday. today the bite is very swollen. the redness and swelling extend a little over an inch and a half. in the last two hours a straight line has formed. it is a half inch wide a bit under 6 inches long and heading up my arm from the bite. it is aching and itchy. no serious pain though. any idea of what it could be or if i should be worried? the bite happened in southern california