Medically reviewed by Casey Gallagher, MD Armpit rashes can be caused by allergic reactions, infections, and chronic conditions. Armpits are a common place to get rashes because the skin there is thin ...
Other important signs of breast cancer to look for are: A new lump or thickening in your breast or armpit A change in size, shape or feel of your breast Skin changes in the breast such as puckering, ...