Red inflammed rash under breast from improper bra,sweating from it-not always itchy,sometimes itchy.have it for 4 days now.what to put on it,steroids?

Anti fungal: It is probably a yeast infection. You can use lotrimin (clotrimazole) cream OTC along with steroid cream.

Dr Cannon and another doctor agreed

Antifungal first: Try an antifungal like Lamisil (terbinafine) or clotrimazole(Lotrimin) first. Fungi like sweaty, dark places. Apply antifungal cream twice daily for 2-4 weeks. When in private, go braless. It does not contribute to later sagging. In fact, the opposite. Herald patch again? Poor you. At least it is benign and will go away.

Likely fungal: As suggested previously, you may try anti-fungal cream first. But if the itching becomes intense , a topical hydrocortisone cream can be used for a few days. In the future, if you continue to have a sweating problem , you may use alum-containing powder on a regular basis under your breasts. If you are overweight, then weight loss will likely be helpful .