Armpit lumps are a common response to infections and vaccines, but they can sometimes be a sign of more serious ...

People with underarm hidradenitis suppurativa often develop armpit abscesses, painful lumps under the skin that are filled with pus. Usually caused by a bacterial infection, they can appear red and ...

Right-sided pain under the armpit may be due to muscle strain, infections, or skin conditions. Sometimes, armpit pain may indicate a more serious issue, such as cancer or a heart issue. The armpit ...