Skin cysts are common and usually harmless. However, when bacteria enter a cyst, it can become infected, causing pain, swelling, redness, and pus formation. Infected skin cysts often look alarming, but with proper medical care, they can be treated effectively.
The images above show inflamed cysts with visible pus, a sign that infection is present and medical attention is needed.
What Is a Skin Cyst?
A skin cyst is a closed sac beneath the skin that contains fluid, keratin, or other material. Common types include:
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Epidermoid cysts
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Sebaceous cysts
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Pilar cysts
Most cysts grow slowly and are painless. Problems occur when a cyst becomes blocked, irritated, or infected.
What Causes a Cyst to Become Infected?
A cyst can become infected when bacteria enter through a small opening in the skin. Common causes include:
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Blocked hair follicles
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Skin trauma or friction
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Poor hygiene or heavy sweating
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Attempting to squeeze or pop the cyst
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Weakened immune system
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Chronic skin conditions like acne
Once bacteria enter, the body reacts with inflammation, leading to pus buildup.
Signs and Symptoms of an Infected Skin Cyst
An infected cyst often shows clear warning signs, including:
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Redness spreading around the cyst
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Swelling and firmness
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Pain or tenderness
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Warmth in the affected area
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Yellow or white pus drainage
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Shiny, stretched skin
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Unpleasant odor from discharge
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Fever (in more severe infections)
The images demonstrate active infection, with central pus and surrounding inflammation.
Why Infected Cysts Should Not Be Ignored
Leaving an infected cyst untreated can lead to complications such as:
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Abscess formation
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Cellulitis (infection spreading into surrounding skin)
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Scarring
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Recurring infections
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Rarely, systemic infection if bacteria spread
Early treatment helps prevent these outcomes.
How Are Infected Skin Cysts Treated?
Treatment depends on severity and should be done by a healthcare professional.
1. Medical Drainage
A doctor may carefully open and drain the cyst using sterile instruments. This relieves pressure and removes infected material.
2. Antibiotic Treatment
Topical or oral antibiotics may be prescribed to control bacterial infection.
3. Surgical Removal
If cysts recur or do not heal properly, complete removal of the cyst wall may be recommended to prevent recurrence.
4. Supportive Home Care (Mild Cases Only)
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Warm compresses (10–15 minutes, several times daily)
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Keeping the area clean and dry
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Avoiding pressure or friction
⚠️ Never attempt to pop or drain a cyst at home, as this can worsen infection and increase scarring.
When to Seek Medical Help Immediately
You should see a healthcare provider if:
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The cyst becomes very painful
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Redness spreads rapidly
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Fever develops
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Pus continues to drain
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The cyst grows quickly
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The infection keeps returning
Prompt care leads to faster healing and fewer complications.
How to Reduce the Risk of Future Infected Cysts
Preventive steps include:
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Maintaining good skin hygiene
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Avoiding squeezing or picking skin bumps
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Wearing breathable clothing
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Treating acne early
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Keeping wounds clean and covered
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Managing underlying skin conditions
Final Thoughts
Infected skin cysts can look severe and uncomfortable, but they are treatable when managed correctly. Recognizing the signs of infection and seeking proper medical care is the safest approach.
If you notice redness, pain, swelling, or pus, avoid self-treatment and consult a medical professional.
