Red bumps under my armpit and on my side?

i have like 20 they hurt so bad, i have these red bumbs that are dime size or bigger under neath my armpit and on my side and they burn and itch! it is awful, the ones on my side dont hurt as bad as the ones under my armpit first maybe i though it was because sweat but i use deoderent twice a day and went and check if i was sweating and i wasnt, they really hurt and burn and itch. has anyone he=ad these or no how to get them to feel better???