Medically reviewed by Casey Gallagher, MD Key Takeaways Armpit rashes can be caused by allergic reactions to deodorants or shaving creams.Keeping the area clean and avoiding shaving helps treat mild ...

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.

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 ...