I have burning sensation pain in my under arm particular on the right side.

I have also had ache and burning sensation pain under my arm, especially on the right side. No lumps either. Pain lasted 2 months more or less. Haven't felt that again for two months now.

I'm sorry about your pain, try to take it easy when it flares up,or I'm afraid you could end up suffering in a lot more pain like me, I didn't heed the warning signs and now I have problems with the use of my arms and hands now. So please take it easy when it starts to flare up for you.

My recent rotator cuff surgery had other sutures were done, something to do with my biceps and my under arm area yo my low side hurt after 4 months

I too have pain under my arms, and everywhere else, i sometimes worry that there might be something serious wrong, but every time I see a doctor or specialist for whatever it is, it gets put down to my fibromyalgia x