 [ Symptoms ] painful mole or skin tag burns constantly a few years ago i noticed a small bump under my left armpit at first it never bothered me and i thought it was going to turn into a skin tag but it never has it is like a small plateau shaped mole that is about the same color as my skin it constantly has a throbbing burning sensation to it and sometimes stings like being stung or poked with a needle it is more irritating than anything and i was just wondering what it could be [ Disease ] it seems you are having the complications of late or untreated lyme disease neurological conditions associated with late lyme disease are treated with intravenous antibiotics usually ceftriaxone or cefotaxime given daily for two to four weeks these symptoms usually resolve gradually over time taking more antibiotics does not improve symptoms or shorten the course of post lyme symptoms hope this helps you thanks