If you have a smelly rash under your breast, it could be caused by a skin condition called intertrigo, which is a benign skin condition caused by moisture, heat, lack of air circulation, and friction between skin folds. It can also be caused by a yeast infection, which can cause a raised, shiny, reddish-brown rash where the skin folds under the breast. Here are some product details, positive and negative aspects, and ingredients or materials that can help with these conditions:

Intertrigo:

• Products: Zinc oxide-based creams like Zincofax, diaper rash creams, cornstarch or baby powder, Noxzema skin cream, Gold Bond.
• Positive aspects: Zinc oxide-based creams can protect skin from moisture and irritation, and diaper rash creams can help soothe and dry out the rash. Cornstarch or baby powder can absorb moisture and reduce friction. Noxzema skin cream and Gold Bond can also help soothe and dry out the rash.
• Negative aspects: Some products may cause stinging or burning if applied to a rash.

Yeast infection:

• Products: Antifungal creams or ointments.
• Positive aspects: Antifungal creams or ointments can help treat the infection.
• Negative aspects: None mentioned.

Its important to note that if you have a smelly rash under your breast, its best to consult a healthcare provider to determine the cause and appropriate treatment.