I took out my wisdom tooth and i am having temperature of 99.5-100.4 (37.5-38) under armpit. is this a fever? what to do in this case? i was not given antibiotics. what temperature is considered ok under armpit for wisdom tooth removal?

In the US. most temperatures are on forehead , wrist or oral, so armpit may not be as accurate. Either way a temperature is of concern and you should contact your doctor. Antibiotics are given with difficult extractions as a precaution against infection and pain medication. If you are having swelling and pain ask for medication.

Your fever may be caused by a post surgical infection or something as innocuous as a cold. Call your Oral Surgeon. (S)he is responsible fornyour post-procedure care.