Painful armpit lumps are often due to a swollen axillary lymph node under the armpit. This is usually a sign that the body is fighting an infection, but it can sometimes indicate cancer.

After a while I began to get small painful lumps under my armpits about once every two weeks or so. They last about a day and then disappear. I started using deodorant again but I keep getting them.

Medically reviewed by Casey Gallagher, MD Armpit rashes often develop due to allergic reactions, infections, and chronic ...