There is a rash at the bass of my arm pitt and one on my back. the rash is small.each bump has a black dot. it's inflammed and has a burning sensation?

Glands: Hi Sorry to hear you've been dealing with rash issues. There are glands under the arm pit that can commonly become clogged and become infected. We have larger glands there that you wouldn't find elsewhere, like say your forearm. If you shave, it is also common to get ingrown hairs. Usually these issues are self resolving. More info: http://wb.md/2pAk5BC Hope this helps!