A growth behind the earlobe that squeezes out blood may be a sebaceous cyst with infection, a boil on the external ear canal, or acne. 1. Sebaceous cyst with infection: sebaceous glands are distributed all over the body, and sebaceous cysts are easily formed when the sebaceous glands of the hair follicles behind the earlobes are clogged, and are most common on the head and face. If there is a secondary bacterial infection, it may lead to pus and bleeding when squeezed. 2. External auditory canal boils: due to the invasion of Staphylococcus aureus, Streptococcus aureus and Escherichia coli from the mouth of the hair follicle, thus causing localized infection, bleeding lumps, and pus plugs can be seen on the surface. Bleeding may occur after the pus plug is punctured and the pus is squeezed out. 3. Acne: It is a chronic inflammatory skin disease of the sebaceous glands of the hair follicles, and pustules and papules may appear. Blood can also be squeezed. It is recommended that patients avoid squeezing the body surface lumps to prevent the spread of infection, can go to the hospital, under the guidance of the doctor to clarify the diagnosis, standardized treatment.