Recurring Pimple On Breast. You should always keep this area dry and clean even if it means washing more than two times a day especially when the heat is unbearable. This can either be a bacterial infection fungal or yeast infection under breast.

Considering you have large breasts you probably sweat a lot in the area and this must be why your pimple occurred. If it still persists after the antibiotics it will have to be drained out by a surgeon. Usually a boil is a swollen bump under the skin.
But these bumps are not ALL symptomatic of serious illness.
Avoid breast acne by using antibacterial soap or an anti-acne. It results from milk becoming trapped in the breast and a bacterial infection in the area. According to scientists at the University of California the pressure on the chest may adjust the mammary gland back to the normal developmental pattern and thus help prevent breast cysts. Considering you have large breasts you probably sweat a lot in the area and this must be why your pimple occurred.