I have always had uber sensitive underarms. It's definitely controlled me during warm seasons. I can only shave my underarms once a week or else they will break out in pimple like bumps. During the summer I can't just throw on a tank top, or when I go work out, I have to wear a t shirt most of the time. I can wear a tank top maybe 2 times a week and it has to be very calculated, it has to be the day I shave and the day after only, I also could only wear shirts that were loose in the armpit area until I had atleast 4 days post shaving. Dove sensitive deodorant 1/4 moisterizers was the only kind I could use, even when exercising, it didn't do a great job, but my underarms couldn't handle anything else. One summer I developed a huge boil on my underarm, it was right below the crease, it went all the way from one side to another, and was about the diameter of a quater from top to bottom. It took one week of heat pads to bring it to a head and about 2.5 days to fully drain it. I could not wash my underarms with a loofa for about 4 days after shaving because it hurt and could potentially make me break out, I'd have to squirt my body wash in my hand and wash them that way.
I got a groupon for a local medspa for 5 treatments for the underarm area. I've only had my first 2.5 weeks ago. I read on the internet that I needed to go in with 3 days stuble (ends up they wanted me fully shaved) it didn't matter though, they did it anyway. I didn't shave because I was waiting for the hairs to "fall out" but they didn't. My underarm hair grew maybe 2 days worth more, and then just completely stopped. I was still waiting for them to fall out, but eventually just shaved.
That was Monday (today is thursday) Typically the very next day after shaving I have a stubble that I can feel, and the day after that a stubble I can see. 4 days out and my armpits are still smooth and soft. Not only that the next day after shaving I was able to scrub my underarms with my loofa!!! I am so happy with this one treatment, if I had to guess I'd say it removed 25-40% of my underarm hair. I WILL come back and update!