L72.0 Epidermal cyst

Name of the Condition

• Epidermal Cyst

Summary

Epidermal cysts are non-cancerous, slow-growing lumps beneath the skin filled with keratin, a protein produced by skin cells. They typically appear as smooth, round bumps and are common on the face, neck, trunk, or scalp. These cysts are generally painless unless inflamed or infected.

Causes

Epidermal cysts form when the surface of the skin (epidermis) grows inward, trapping keratin beneath the skin. This can occur due to trauma, a blocked hair follicle, or a disruption in skin cell turnover. The trapped keratin accumulates, forming a cyst.

Risk Factors

• Skin trauma: Injury to the skin may increase risk.
• Obstructed follicles: Conditions like acne or ingrown hairs can contribute.
• Genetic predisposition: Some individuals may have a higher likelihood due to family history.

Symptoms

• A small, firm, mobile bump under the skin.
• The cyst may have a central blackhead (keratin plug).
• Pain, redness, or swelling if infected or inflamed.

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 infected or painful cysts.
• Surgical excision: Complete removal to prevent recurrence, often done for large or bothersome cysts.

Prognosis and Follow-Up

Epidermal cysts are benign and rarely cause complications. Recurrence is possible after incomplete removal. Follow-up may be recommended if the cyst becomes inflamed or infected.

Complications

• Infection or abscess formation.
• Rupture, leading to inflammation or scarring.
• Rarely, cosmetic concerns if the cyst is large or in a visible area.

Lifestyle & Prevention

• Avoid picking or squeezing cysts to prevent infection.
• Keep the skin clean and moisturized to reduce irritation.
• Protect the skin from trauma or injury.

When to Seek Professional Help

Seek care if the cyst becomes painful, red, swollen, or drains fluid, as these may indicate infection. Also, consult a provider if the cyst changes in size, shape, or color.

Tips for Medical Coders

Document the location, size, and whether the cyst is infected or inflamed. For excision, note if the cyst was removed intact or drained. Ensure documentation supports the clinical decision and aligns with the ICD-10-CM code L72.0 for accurate coding.