L72.11 Pilar cyst

Name of the Condition

• Pilar cyst

Summary

Pilar cysts are non-cancerous, slow-growing lumps that form beneath the skin, typically filled with keratin. They commonly appear on the scalp but may also occur on the face, neck, or trunk. These cysts are generally painless unless inflamed or infected.

Causes

Pilar cysts develop when hair follicles become blocked, leading to a buildup of keratin. The exact cause is often unclear, but they may result from genetic factors or natural skin cell turnover. They are thought to arise from the outer root sheath of hair follicles.

Risk Factors

• Genetic predisposition: A family history of pilar cysts increases risk.
• Age: More common in middle-aged adults.
• Gender: Slightly more prevalent in women.

Symptoms

• A firm, round bump under the skin.
• Usually painless but may become red, swollen, or tender if infected.
• May have a visible opening or blackhead at the surface.

Diagnosis

Diagnosis is typically made through a physical examination of the cyst’s appearance and texture. A biopsy may be performed if the cyst is atypical or if malignancy is suspected.

Treatment Options

• Observation: Small, asymptomatic cysts may not require treatment.
• Incision and drainage: For painful or infected cysts.
• Surgical removal: Complete excision to prevent recurrence.
• Antibiotics: Prescribed if infection is present.

Prognosis and Follow-Up

The condition is benign with no major health risks. Recurrence is possible after removal, especially if the cyst wall is not fully excised. Regular follow-up may be recommended to monitor for new cysts or complications.

Complications

• Infection or inflammation of the cyst.
• Scarring or discomfort from surgical removal.
• Rarely, rupture or leakage of cyst contents.

Lifestyle & Prevention

• Avoid squeezing or manipulating cysts to prevent infection.
• Maintain good scalp hygiene to reduce irritation.
• Seek prompt treatment for any signs of infection or inflammation.

When to Seek Professional Help

Consult a healthcare provider if the cyst becomes painful, red, swollen, or shows signs of infection. Also seek care if the cyst changes in size, shape, or appearance, as this may indicate a need for further evaluation.

Tips for Medical Coders

When coding for pilar cysts, use ICD-10-CM code L72.11. Ensure documentation includes the location, symptoms (e.g., pain, infection), and any treatment provided. Note whether the cyst is simple, infected, or requires surgical intervention to support accurate coding.