My sister had the same problem with her underarms. She gets horrible in grown hairs. It looks like a lump in her under arm. I didn't even know an ingrown hair could look like that! She was introduced to a product called Tend Skin (www.tendskin.com) and she swears by it. She hasn't really had a problem with ingown hairs since using the product and it cleared up the massive one quickly. I think it's sort of pricey but she thinks it worth every cent! I know she purchases it at various spas around here that do waxing, plucking and such. She tried everything prior to this product and found this was the only thing that really made a difference.