Is it happening after you shave. I have found the best thing for ingrown hairs after shaving is plain old baby powder. BUT, if it is just happening randomly without shaving, I would make sure you use an antibacterial soap every day or twice a day. Make sure your underarms are dry at all times. My friend has this problem, they call it hydradenitis (infection of sweat or apocrine glands) and she has to take antibiotics as soon as one starts. Wearing loose clothing and losing weight if you are overweight also helps. good luck.
When I worked in a dime store a very popular product we sold was shaving powder. Men with curly hair tend to have problems with ingrowns -- "razor bumps" they were called. I don't know how the stuff works but these men swore by it. Shaving powder comes in a can and you can find it with the other shaving stuff. Maybe this will help your problem. Good luck and good health to you!
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