Yes, there are over-the-counter products that you can use to treat redness under your breasts, which is often caused by a fungus. One commonly recommended cream is clotrimazole 1%, which can be found in brands like Canesten. It is applied twice a day until the redness heals, with an extra couple of days afterwards to ensure the fungus is gone. In addition to using the cream, it is important to keep the area under your breasts dry, especially after bathing, showering, or sweating. Wearing breathable clothing and changing out of wet bras promptly can also help prevent redness. Powders like Sween can be applied to keep the area dry and prevent redness from returning.