Bumps, hard lumps and bleeding in the buttocks may be caused by external hemorrhoids, perianal abscesses and boils. 1. External hemorrhoids: a hard lump is visible at the anal opening, which may be accompanied by swelling and pain, itching, blood in stool and other symptoms. 2. Perianal abscess: the skin shows redness, swelling, pressure and pain, and sometimes a hard lump can be touched, and pus is discharged after the abscess breaks down or forms an anal fistula, which can be blood-colored. 3. Boils: they occur in the head, face, neck, buttocks and other parts of the body, mainly presenting as small hard nodules with local redness, swelling, heat and pain, and pus can be discharged after its rupture, which may be accompanied by bleeding. It is recommended that people with bumps, hard lumps and bleeding in the buttocks should go to the hospital in time to clarify the cause of the disease and carry out standardized treatment under the guidance of the doctor.