Red Pimple On Breast Causes. The immune system responds to the bacteria and pus that are found in the zits. The two are known to affect the subcutaneous layer of the skin on breast causing itching and irritation of the skin.

If you have a red spot on your breast that appears to be a pimple or bug bite it could very well be either of those. It is a burning condition caused by Staphylococcus aureus infection affecting the subcutaneous layer of the skin on the breast. Breast fungus and cellulitis condition caused by staphylococcus aureus infection can also cause the redness on breast.
Red pimples or acne bumps on the breast whether they are large or small may be sources of worry.
Is a bleeding mole always cancer. The skin of the breast is like the skin on any part of the body and subject to many abnormalitiesThis is most likely a skin problem probably a boilIn the mean time you may apply warm compressesuse antibacterial soap and see how it goes. Hormonal changes in teenagers and during pregnancy. Pus usually forms when the body is fighting some type of infection and can affect any part of the body.