gosh, sounds awful. i had exactly the same a few summers ago. i went to a so called professional due to my reliable and excellent beautician having moved area. when i was on holiday a big bruised lump came up just above my groin area. my husband had a close look and said it was probably an infected hair. it eventually burst with lots of pus inside so be aware of it when it gets real big and soft. i also had one a few years ago, i went to docs, he advised me to wear those bridget jones pants, i was so embarassed, anyway he said it was an infected hair down below.,. it burst so as it was in my groin i couldnt go work and found it as a good excuse not to go to work!! had to let it dry out as knickers rubbed on that bit. best of it was, i was sitting on settee infront of guess fire letting it dry out when the white arow man knocked on the door!!!!!! will never live it down!!