There are many reasons for small nodules in the breast, which can be seen in the following areas: 1. skin allergy, the breast is exposed to allergic substances that cause the skin to grow papules in the area, above the skin surface, which can be accompanied by a burning sensation and itching, and requires timely anti-allergy treatment can not be used casually. 2. enlarged lymph nodes, lymph nodes are very sensitive tissue, and many diseases can be reflected in the lymph nodes. The lymph nodes can obviously be touched or even protrude from the skin surface and are accompanied by pain, fever and other symptoms. 3, breast enlargement, benign lesions related to endocrine disorders, the enlarged glandular lobules can be touched. The pain will disappear at the end of menstruation, and the nodules need to be operated. 4.Breast cancer is a gravel-like nodule, which is usually painless, but invading the nerves will have no relation to menstruation.