There is a raised area of tissue under the armpit that is painful upon palpation, without redness or swelling.

There is a raised area of tissue under the arm that is painful upon pressure but not red or swollen. This may be caused by folliculitis, lymph node enlargement, sebaceous cysts, or other conditions, and treatment should be targeted according to the specific cause. Detailed analysis is as follows:

1. Folliculitis

Folliculitis is an inflammatory condition caused by infection of hair follicles. Because the armpit tends to sweat heavily, poor hygiene may lead to local skin infections, resulting in red, inflammatory papules that are firm in texture and may be tender to touch. Under medical guidance, topical medications such as erythromycin ointment or fusidic acid cream can be used for relief.

2. Lymph Node Enlargement

Enlarged lymph nodes are primarily caused by bacterial infections. When lymph nodes under the arm become enlarged, nodules can be felt, and tenderness in the armpit may occur due to inflammatory stimulation. Medications such as cefradine capsules or roxithromycin capsules may be used as directed by a physician for symptom relief.

3. Sebaceous Cyst

If local hygiene is neglected, the sebaceous gland ducts may become blocked, preventing the normal discharge of sebum. Prolonged accumulation beneath the skin may lead to pain. Surgical removal is an effective treatment option.

In addition to the above common causes, other possible conditions include lipoma, soft fibroma, or schwannoma. If any discomfort occurs, prompt medical evaluation and timely treatment are recommended to avoid delaying diagnosis and management.