Back breaking out?!?

Im 23 and suddenly for the past month or 2 my back has been breaking out and i can't figure out why. Has to be something that's coming in contact with it maybe? Idk but anyway does anyone know what i can do to to get rid of these? I can feel them more than i can see them but they are red. I did notice my back is more oily but does anyone know an easy method or like an at home method like toothpaste or something 😆 thanks. It's driving me nuts