When I worked in hospitals I looked after loads of blokes (never women) with those.
They were often professional drivers. A bit overweight, sitting down a lot, sweaty, ignoring the bumcrack soreness until it became really unbearable...

Last year I chatted to a lorry driver at a car boot sale and we got on to the subject of abscesses, as you do.

I advised him never to ignore soreness in his arsecrack area and he was so grateful that he sold me a digital camera with no lead or accessories for £1. Result!
(Juan Quar is clinging to her front teeth on, Fri 12 Jul 2013, 23:10, Reply)