What should I do if a lump and pain appear in the groin area?

Dec 01, 2025 Source: Cainiu Health
Dr. Liu Wenmin
Introduction
Lumps and pain in the groin area may be caused by local friction, insect bites, folliculitis, lymphadenitis, or infected sebaceous cysts. Symptoms can be improved by reducing friction, maintaining cleanliness, proper skin care, and medication. If the lump increases in size, pain worsens, or is accompanied by fever, prompt medical attention is necessary. Tight clothing and frequent physical activity can lead to repeated friction on the skin in the groin area.

Lumps and pain in the groin area may result from local friction, insect bites, folliculitis, lymphadenitis, or infected sebaceous cysts. Symptoms can be improved through reducing friction, proper cleaning and care, and medication. If the lump increases in size, pain worsens, or is accompanied by fever, prompt medical attention is necessary.

1. Local friction: Tight clothing or frequent movement can cause repeated skin friction in the groin, leading to tissue congestion and swelling, forming a lump with tenderness upon pressure. It is recommended to wear loose, breathable cotton clothing and reduce strenuous activities to avoid further irritation.

2. Insect bites: Insect bites during summer can inject saliva into the skin of the groin, triggering localized allergic inflammation, resulting in red lumps accompanied by itching and stinging. Clean the area with soapy water, apply a gentle anti-itch lotion, and avoid scratching to prevent infection.

3. Folliculitis: Bacterial infection of hair follicles causes inflammation, leading to red papules or pustules in the groin area, often with a hair at the center of the lump and significant pain. Under medical guidance, topical medications such as mupirocin ointment, erythromycin ointment, or oral cephalexin capsules may be used to relieve symptoms.

4. Lymphadenitis: Infection in surrounding tissues may spread to the lymph nodes in the groin, causing swollen lymph nodes (lumps) that are tender to touch, possibly accompanied by low-grade fever. Under medical supervision, medications such as amoxicillin-clavulanate potassium tablets, Pudilan anti-inflammatory oral liquid, or levofloxacin capsules may be prescribed to alleviate discomfort.

5. Infected sebaceous cyst: Blockage of sebaceous gland ducts leads to accumulation of secretions, which may become secondarily infected, forming a firm, painful, red, and swollen lump. Under medical advice, medications such as cefuroxime axetil tablets, metronidazole tablets, or fusidic acid cream may be used to improve symptoms.

Keep the groin area clean and dry; wash daily with warm water and thoroughly dry afterward. Wear loose, breathable clothing, avoid prolonged sitting or standing, maintain a light diet avoiding spicy and irritating foods, and engage in moderate physical activity to promote local blood circulation.