Hiya! I feel ya, diagnosed at 19 and now I'm 22 (but had it since I was 16).
I just had bilateral underarm surgery- both at once. No skin graft for me (your dr generally can't call those things, surgeon decides on skin graft or open wound packing). Took 4 months to completely heal, but my god it was worth it! (I had open wound packing).
I'm trying to avoid a groin surgery now. No thanks!
But I've found that turmeric helps, so many people who suffer this swear by it. I'd grab a turmeric supplement and a zinc supplement. Both aid so much in flare ups. I just started a few days ago and have noticed a difference.
Salt baths also help, soaking your wounds in the salt sterilises them and does so many things to help! Even if it's just 20 mins, shove some salt in your bath if you have one and soak in it.
A lot of people find dietary links to their flare ups. Nightshades and dairy seems to be the main culprits. Some people have food sensitivities to these and have found that by cutting them out completely that their flare ups ceased. (The elimination diet is the way to find this, going paleo and introducing food groups into your diet one by one).
If you smoke, it's always good to cut back. I find I flare up worse when I smoke more (coincidentally, tobacco is a nightshade).
Avoid humidity, sweating makes it worse and hot temperatures. I find that showering off when I've sweat a lot helps too.
I've found that the way my cysts have stopped coming back is from surgery where they remove not only the cysts, but the skin and the glands too. I've had no reoccurrences under my arms since the surgery in June 2016. The surgery process was long and daunting at times, but I can move my underarms with full range and wear tank tops for the first time in years! And they resemble normal armpits (Exception of scars but they look cool as)! Much better than before.
If you're going surgery route and would like advice on that, let me know and I'll give you all of the tips I wish I'd known before my surgery.
Best of luck!