A small lump felt on the right side of the rib cage is considered to be related to trauma, sebaceous cysts, fibromas, lipomas, cholecystitis, herpes zoster, folliculitis and other conditions. 1. Trauma: If the right side of the ribcage is traumatized, it may lead to muscle damage, which makes the surrounding soft tissues stick together in this area and form hard bumps. 2. Sebaceous cysts: When the contents under the skin are discharged, the sebaceous glands are blocked, and hard lumps may form in the area, which may be accompanied by pain and redness. 3. Fibroma: Nodules or pimples will grow on the right side of the ribs of the patient, which are relatively hard to the touch. 4. Lipoma: generally belongs to benign tumors, which may grow on the trunk or limbs, and are painless raised bumps. 5. Cholecystitis: if the patient has cholecystitis, the right upper abdomen will appear abdominal distension, hard lumps, nausea and pain, etc., and there may be radiating pain. 6. Herpes zoster: if the bumps are blisters, and accompanied by obvious pain may be herpes zoster. 7. Folliculitis: If the bumps are red, swollen and raised, with white pus spots at the top, it may be folliculitis. Considering that there are many causes, it is best to consult a doctor in time and do a systematic examination.