I know this is an old thread, but i'm going to bump it in case anybody else is experiencing this.
For the last few years i've had reoccurring boils on my inner thighs. I wear tight skinnies most of the time, so I thought perhaps this was the cause (it certainly was making them more likely to happen). The boils weren't too painful and I was able to go about my daily business alright. However, in the last few months the boils started to get much worse. Whereas before they were periodical, they started to become much more frequent. As soon as one would go another would come up and now I usually get 2-3 at a time. Twice now the boils have become so severe that they feel like my inner thigh was on fire. I could barely walk without being in severe pain.
I was in the last few months of my degree when I started to get them quite bad and they got worse when I started a new job so, naturally, my family and I thought it was all the stress that was causing them. They were getting badly infected so I thought enough is enough, I need to see the doctor. He put me on a weeks course of flucloxacillin and today I had to go for a blood test. The doctor wants me to be checked for diabetes, immune system function, liver and kidney function, thyroid and a general blood check because he believes there is an underlying cause. I have to wait a week now to find out if the blood tests show anything (quite nervous actually, i'm only 24).
Anyway, the point is, don't hesitate (and I urge you to) see your GP. It could turn out to be nothing, but it's always best to check. That is what they are there for and why you pay NI (or will do someday). Don't forget they get paid to do this and its always better to be safe than sorry. Get yourselves checked out because it could be something simple or it could be a big underlying cause.