Need advice on popping lumps under my skin

bfrb warning ive started what i can only assume is "popping" or squeezing the lumps of fat under my skin until i feel them give (feels similar to a pimple? but nothing comes Out its just under my skin) this leads to Heavy bruising wherever i do it the lumps also seem to come back harder? but that could just be my brain messing with me either way they usually "pop" all the same how dangerous is this action? does anyone else do this? how do i stop? its pretty painful and Looks gnarly visually but i literally cant stop my hands sometimes its like subconscious