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Dr Muhammad Faizan August 09, 2025

 


Armpit Cyst: Causes, Symptoms, and Treatment

An armpit cyst is a small, round lump that forms under the skin in the armpit area. Most are harmless, but they can be uncomfortable or bothersome, especially if they become swollen or painful.

What Is an Armpit Cyst?

A cyst is a sac filled with fluid, pus, or other material. In the armpit, cysts often form because of:

  • Blocked sweat glands

  • Ingrown hairs

  • Infections

  • Skin irritation or shaving

  • Certain skin conditions, like hidradenitis suppurativa

Cysts are not usually cancerous, but any new lump should be checked by a healthcare provider to rule out more serious conditions.

Common Symptoms

  • A soft or firm lump under the skin

  • May feel tender or sore

  • Can grow over time

  • Sometimes red, inflamed, or filled with pus if infected

Causes

  1. Ingrown Hairs
    Shaving can cause hair to grow back into the skin, leading to cysts.

  2. Blocked Sweat Glands
    The armpit has many sweat glands, which can become blocked and form cysts.

  3. Infection or Inflammation
    Bacteria can get trapped in a hair follicle or gland, leading to a cyst or abscess.

  4. Skin Conditions
    Chronic skin problems like hidradenitis suppurativa cause recurring cysts or boils in the armpit.

Treatment Options

  • Warm Compresses: Applying a warm cloth can help the cyst drain naturally.

  • Over-the-Counter Creams: Antibacterial or anti-inflammatory creams may reduce swelling.

  • Medical Drainage: A doctor can safely drain the cyst if it becomes painful or infected.

  • Antibiotics: Needed if the cyst is infected.

  • Surgical Removal: For large, painful, or recurring cysts, minor surgery may be recommended.

⚠️ Do not try to pop or squeeze a cyst at home. This can cause infection or worsen inflammation.

When to See a Doctor

  • The cyst is growing quickly

  • It’s painful or filled with pus

  • Redness or warmth is spreading

  • You have recurring cysts in the same area

Conclusion

An armpit cyst is usually not serious but can be uncomfortable or irritating. With proper care and attention, most cysts heal on their own or with minor treatment. If you're unsure about a lump or if it's painful, talk to a healthcare provider for the right diagnosis and care.

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