Small bumps appearing under the left ear are mainly considered to be related to factors such as lymphadenitis, folliculitis, sebaceous cysts and keloids. 1. Lymphadenitis: it can lead to enlarged and congested lymph nodes and pimple-like bumps. 2. Folliculitis: It can lead to the appearance of pimple-like bumps on the affected area, accompanied by symptoms such as redness, swelling, heat and pain. 3. Sebaceous cysts: can lead to swelling under the skin of the affected area, as small as a grain of rice, as large as an egg, growing more slowly, and often no other symptoms. 4. Keloids: Small keloidal bumps may appear under the left ear if there has been a history of external injury or surgery. Bumps under the left ear may also be related to other factors such as tumors, inflammatory stimuli, etc. It is recommended to consult a doctor to confirm the diagnosis and follow the doctor’s instructions for treatment.