A small flesh-colored lump has appeared under the armpit and is growing larger.

A small fleshy lump under the armpit that gradually increases in size may be caused by accessory breast tissue, swollen lymph nodes, lipoma, or other reasons. Treatment—whether medication or surgery—should be determined based on the specific cause. Detailed analysis is as follows:

1. Accessory Breast (Polymastia)

This refers to the presence of extra breast tissue outside the normal breasts, commonly developing under the arm or in front of the armpit. The typical symptom is a lump appearing on the chest wall or in the armpit area. The primary treatment is surgical removal.

2. Swollen Lymph Nodes

This condition involves enlargement of one or more lymph nodes, often presenting as palpable lumps under the arm, with or without symptoms such as redness, swelling, warmth, or pain. Treatment may include medications such as thalidomide tablets or amoxicillin capsules, taken as directed by a physician.

3. Lipoma

A lipoma is a benign tumor formed by abnormal proliferation of fat cells and accumulation of adipose tissue, which can occur in any part of the body where fat is present. Generally, small lipomas do not require special treatment; however, if they cause compression symptoms, surgical removal may be recommended.

In addition to the common causes mentioned above, other possible causes include folliculitis, sebaceous cysts, lymphoma, etc. If you experience any discomfort, it is advisable to seek timely medical evaluation and treatment.