Some causes of underarm rash include infection, allergic reaction, and inflammation. Itchy, inflammatory, bacterial, or fungal rashes in your armpit can be mild or severe, short-lived or chronic.

Medically reviewed by Theresa Marko, PT, DPT, MS Key Takeaways Armpit pain can come from injuries, infections, or swollen lymph nodes.  To diagnose armpit pain, doctors may use lab tests, physical ...

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 ...