There are various reasons for a small circle of particles next to the nipple, which are analyzed as follows: 1. Nipple allergy. The nipples are exposed to poor quality underwear or creams, resulting in papules, itching and redness of the nipples, which need to be kept away from allergic substances and treated with antihistamines. 2. Montserrat nodules. The normal physiological structure will bulge when stimulated by cold and fear, just like goose bumps, which are normally in a closed state and open during breastfeeding. 3. Nipple eczema. An inflammatory disease of the nipple caused by internal and external factors, manifesting as papules, erythema, erosion, itching and pain. 4. Eczema-like carcinoma of the nipple. A kind of carcinoma in situ, which can be cured by early surgery, with papules, overflow and pain in the nipples.