Search for "saddle sores" - you'll also get lots of useful info in those threads.

Alot of the girls here use "pimple" creams - even on blind infections. I use aftershave after a ride/shower, that helps too.

I have fewer bumps/infections if I trim, rather than shave.

If not treated, they can become cysts... remember, thats why Lance didn't realise he had testicular cancer, he thought the lumps and bumps were 'normal'.

I know a couple of people who have had golf-ball size lumps in their groin from cycling (yup, I felt them... after being asked - "is this normal?" ) and often time will fix them. But you may need to seek a doctor's advice.