Can i get a yeast infection under my breasts?

YEAST under breasts: Yeast (candida) thrives in moist places where there is skin-on-skin (yeast intertrigo) e.g. Under the breasts, other skin folds. The best prevention is keep these areas dry with powder or medicated powders. Also topical anti-fungals will help clear up the irritating rash. Yeast rashes seem to more prevalent with warmer weather, too hope you are better!

Yes: Especially is there is a lot of moisture.