A hard lump above the breast near the clavicle may be related to rib tumor, subcutaneous fibroma, sebaceous cyst and other reasons. 1. Rib tumor: rib tumor occurs mostly in middle-aged and old-aged people, which is mainly manifested as a lump with clear boundary and hard texture, which can not be pushed freely. 2. Subcutaneous fibroma: Subcutaneous fibroma is a kind of benign tumor that occurs in subcutaneous tissues, which is mainly due to the secretion of fibers by fibroblasts and the heterogeneous aggregation of fibroblasts. Thus, there is a localized mass, hard, clear boundary, no adhesion, which may be manifested as a hard lump above the breast near the clavicle. 3. Sebaceous cysts: Sebaceous cysts are mainly due to the blockage of the sebaceous gland ducts in the skin, which causes the sebum to form cysts gradually. In the clinic, there will be localized lumps with clear boundaries and smooth surfaces. If the sebaceous glands above the breast develop cysts , they may appear as hard lumps above the breast near the collarbone. If there is a hard lump above the breast near the clavicle, it is recommended to go to the regular hospital for examination in time to clarify the cause of the disease and diagnosis, so as to avoid delaying the condition and producing adverse consequences.