Is it normal i keep getting hard lumps on my body?

These are not like pimples or cysts. These are hard lumps I keep finding on my body. Some of them go away on thier own and some of them I eventually scratch off with tools or from scratching they off till they start to bleed. they are not very large maybe the size of a dime generally. They hurt really bad when I touch them. They appear on my armpit, my middle and my lower back(Where my belt line is). I have gotten 3. Has anyone else encountered these? I ignored them since I figured it would go away on its own and maybe sweat was causing them but they are starting to really hurt. I would stab them but these are often close to very dangerous areas. Like on my spine.