keva,you have my sympathy.Boils and then a hernia lead to me difting away from mountain bikes a few years ago.
I had the blood tests,I'm not diabetic. Had a few courses of antibiotics(can't remember which ones). They would clear up and then flare up again.Had them on my arse and thighs,sometimes a few at a time.Felt unwell for about 3 months. Some would come to a head and had to be squeezed and cleaned up.Some of the feckers had a core,a couple of inches long.Nice! Others would stay red,hurt like hell and then subside.
I became obsessive with personal hygiene,Hibiscrub was my arse-wash of choice. Thankfully,they eventually stopped re-appearing and thankfully haven't returned.
I returned to MTBing about 18 months ago,i use Asoss cream and wear their bibshorts in the warmer months.This probably doesn't make a scrap of difference,but I feel as though I'm being pro-active and the shorts are the comfiest I've used.
Good luck in your battle against the boils!