Pimples on nipples nipple pain can be caused by nipple allergy, nipple eczema, nipple edema and nipple eczema-like cancer. 1. Nipple allergy: wearing corsets made of poor material or using poor quality body milk for a long time can lead to nipple allergy, and pimple-like bumps can appear at the nipple, which can be accompanied by itching, pain and other uncomfortable symptoms. 2. Nipple eczema: due to contact with allergic substances, local stimulation and other factors, can lead to the occurrence of nipple eczema, can appear in the nipple, areola and other places of dark red maculopapular rash, can be manifested as a pimple-like, can appear erosion, oozing, itching and pain. 3. Nipple edema: breastfeeding women due to long-term sucking of the nipple by the baby, the local in a moist environment, can lead to the occurrence of nipple edema, the nipple may appear pimple-like manifestations, may be accompanied by symptoms of pain. 4. Nipple eczema-like cancer: it is a special type of breast cancer, a layer of eczema can appear on the surface of nipple, and the skin can be broken, resulting in the appearance of small ulcers and small bumps, which can be accompanied with pain and burning sensation locally. When there are lumps on the nipple with pain symptoms, one should consult a doctor in time, and under the guidance of specialists, actively carry out appropriate treatments, which can help to alleviate the uncomfortable symptoms as soon as possible.