Name of the Condition

• Follicular cyst of the skin and subcutaneous tissue, unspecified
• Also known as: Epidermoid cyst, sebaceous cyst (in colloquial use, though technically distinct).

Summary

• Follicular cysts are pockets of tissue that form beneath the skin, filled with keratin, a protein produced naturally by skin cells. They often appear as small, painless bumps and are common skin formations.

Causes

• These cysts develop when the hair follicle becomes clogged with dead skin cells. The exact cause is not fully understood, but it can involve trauma to the skin or a blocked sebaceous gland.

Risk Factors

• Factors that may increase the likelihood include:
  • Having acne or previous skin conditions
  • A history of cysts
  • Having a skin injury or traumatic acne lesions

Symptoms

• Visible bump under the skin, typically on the face, upper chest, or upper back
• Sometimes they may become red, swollen, or tender if infected

Diagnosis

• Usually diagnosed through physical examination
• In some cases, a dermatologist might perform a biopsy to confirm

Treatment Options

• Observation: Many cysts resolve without intervention.
• Incision and drainage: Done if the cyst becomes painful or infected.
• Surgical removal: Complete excision is the most effective method to prevent recurrence.

Prognosis and Follow-Up

• Generally benign and often require no treatment.
• Regular check-ups necessary if the cyst changes in appearance or becomes symptomatic to rule out possible complications.

Complications

• Potential for infection or inflammation leading to pain, redness, and swelling.
• Possibility of scarring if the cyst bursts or is improperly drained.

Lifestyle & Prevention

• Avoid squeezing or picking at cysts to prevent infection.
• Good skincare routine can reduce occurrence, though difficult to fully prevent.

When to Seek Professional Help

• Seek medical attention if the cyst is painful, infected, or rapidly growing.

Additional Resources

• American Academy of Dermatology: www.aad.org
• Mayo Clinic: www.mayoclinic.org

Tips for Medical Coders

• Ensure correct documentation as L72.9 is used for unspecified follicular cysts.
• Double-check for any specific identifiers or additional details in the medical record that could specify the cyst type for more accurate coding.