An epidermoid cyst is a small lump filled with keratin — a protein found in skin cells. These cysts form when skin cells multiply under the skin instead of shedding.

📍 Common Features of Armpit Epidermoid Cysts:
Size: Usually small (pea-sized), but can grow over time.
Texture: Firm or rubbery to the touch.
Color: Flesh-colored or slightly yellowish.
Pain: Usually painless, but may become tender or red if infected.
Mobility: It moves slightly under the skin when pressed.

⚠️ When to See a Doctor:

The cyst becomes painful, red, or swollen (could indicate infection).
It drains foul-smelling pus.
It grows rapidly or changes in appearance.
It interferes with movement or causes discomfort under the arm.

🩺 Diagnosis:
A healthcare provider can usually diagnose an epidermoid cyst based on appearance. In some cases, an ultrasound or biopsy may be used to confirm it’s not something more serious.

🧴 Treatment Options:
Watch and Wait: If it’s small and not bothering you, it may not need treatment.
Warm Compresses: May help it drain naturally if inflamed (but don’t squeeze it).
Antibiotics: If it’s infected.
Minor Surgery: A dermatologist or surgeon can remove it completely under local anesthesia. This is the only definitive cure.

Note: If you only drain it without removing the sac, it can come back.

🛑 Do NOT:
Try to pop or squeeze it — this can cause infection or scarring.
Use over-the-counter acne treatments — they are not effective for cysts.