There are many reasons why a 7-year-old girl’s right breast lump protrudes, such as precocious puberty, breast tumor, local soft tissue infection and so on. 1. Precocious puberty: If a 7-year-old girl has a breast bulge or lump, it may be due to precocious puberty, and you can observe whether the girl is accompanied by other precocious puberty manifestations, such as long armpit hair, pubic hair, menstruation, etc. The girl’s right breast lump may be caused by the abnormal function of the hypothalamic-pituitary-gonadal axis. Precocious puberty is usually due to abnormal function of the hypothalamic-pituitary-gonadal axis. 2. Breast tumor: 7-year-old girl’s right breast lump may also be a tumor, such as mammary gland misshapen tumor, mammary gland fibroadenoma, mammary gland lipoma, and so on. 3. Local soft tissue infection: 7-year-old girl right breast lump protrusion may also be due to local skin and soft tissue infection, resulting in local inflammatory reaction, thus causing a lump, which may show local redness, swelling, pain, etc.. There are many reasons why a 7-year-old girl’s right breast lump protrudes, it is recommended to go to the hospital in a timely manner to improve the examination, a clear diagnosis, do not ignore the symptoms, take it lightly, so as not to delay the treatment of the condition.