What causes small lumps under the armpit?

Under normal circumstances, small lumps in the armpit may be related to factors such as fat deposition, folliculitis, lymphadenitis, sebaceous cysts, or lipomas. If discomfort occurs, it is recommended to seek medical attention promptly. Specific analysis is as follows:

1. Fat Deposition

In individuals who are overweight or have excess local fat, small lumps in the armpit may form due to fat accumulation. This is a normal physiological phenomenon that does not require special treatment. It is advisable to maintain a healthy lifestyle to reduce unnecessary fat buildup.

2. Folliculitis

Folliculitis is usually caused by bacterial infection of hair follicles, leading to inflammation. When folliculitis occurs in the armpit, it may irritate the follicles, resulting in red, swollen, and painful lumps, sometimes accompanied by pus formation. Treatment may include medications such as mupirocin ointment, cefuroxime axetil tablets, or calamine lotion, as directed by a physician.

3. Lymphadenitis

Lymphadenitis typically results from reactive enlargement of lymph nodes due to bacterial or viral infections. When lymph nodes in the armpit become inflamed, immune cells within the nodes may become active, forming palpable lumps. This condition is often accompanied by local redness, swelling, pain, and fever. Patients may take medications such as amoxicillin capsules, cefradine capsules, or penicillin V potassium granules under medical guidance.

4. Sebaceous Cyst

A sebaceous cyst forms when the excretory duct of a sebaceous gland becomes blocked, preventing sebum from draining properly. When the sebaceous duct in the armpit is obstructed, sebum cannot be discharged normally, potentially leading to the formation of a lump. These cysts are typically round or oval, with a smooth surface and no adhesion to surrounding tissues. Treatment may include topical medications such as fusidic acid cream, erythromycin ointment, or oral prulifloxacin tablets, as prescribed by a doctor.

5. Lipoma

A lipoma may develop when there is abnormal accumulation of fatty tissue in the armpit. A lipoma is a benign tumor composed of mature fat cells and is typically characterized by slow growth, soft texture, and absence of pain. Small lipomas generally do not require treatment but should be monitored regularly. Maintaining a healthy lifestyle is recommended to help prevent the development of new lipomas.

It is important to maintain good hygiene in the armpit area. Washing the armpits daily with mild soap and water can help keep the skin clean and dry.