There are red sore spot like lumps on my arm pits:(?

in my arm pits, and occasionally on my bum i have sore red sport like lumps. ive tried different deoderants but nothing works!:( they hurt to touch and often have a white head which i can pick off and have puss inside. i've been suffering from them for years now. i thought it was down to hormones but im fed up and they are making me really self conscious and making my life so stressful:( someone help me? i dont know what to do:(