Have had good results in treating itchy/painful bites (such as fleas give), by disolving a plain aspirin or two in a bit of hydrogen peroxide and applying the paste directly on the bite site(s).
Another treatment is heat, either by flame or hair dryer, a heated element, stone, glass, or metal object, etc…the key is to have it get relatively hot, but not so hot that it becomes blistering hot.
If using a flame, one method is to quickly move it to and fro, so the heat doesn’t quickly accumulate to the blistering point.
Also,taking into account that nerve endings desensatize after a bit of heating up, so if the pain starts to dissipate/disappear from being close to the flame then cease application…or damage will continue without the normal alarms going off.
This works for the pain off small infections at or near the surface too.
For example: Ever separate a figer nail from it’s bed, by peeling at something difficult to remove?
Usually it will stay sore for some time…But if heat is applied, enough so it hurts a little and then numbs a little, the germs will be killed, the infection will cease, the pain greatly reduced, as the healing begins.
Do not soak finger tips in hydrogen peroxide, it will wick up between the nail and the nail bed and feel like it’s putting pressure that pushes them apart, lasting for hours and hours.