A "pebble cyst," often confused with an epidermoid cyst, is actually a pilomatricoma, a benign growth under the skin. Dr. Pimple Popper explains that a pilomatricoma, also known as a calcifying epithelioma of Malherbe, is typically a solitary, mobile lump. These growths are not usually painful or uncomfortable.
Key Characteristics of a Pilomatricoma (Pebble Cyst)
| Feature | Description |
|---|---|
| Medical Name | Pilomatricoma (Calcifying epithelioma of Malherbe) |
| Appearance | Solitary, mobile growth under the skin. May feel like a "pebble" due to calcification. |
| Benign or Malignant | Benign (non-cancerous) |
| Pain | Typically not painful or uncomfortable. |
| Misdiagnosis | Often confused with an epidermoid cyst. |
Understanding Pilomatricomas
- Formation: Pilomatricomas arise from hair matrix cells and are characterized by calcium deposits, which give them a firm feel, like a pebble under the skin.
- Location: These growths can occur anywhere on the body but are commonly found on the head, neck, and arms.
- Growth: They are typically slow-growing and can remain stable in size for many years.
- Age: While they can appear at any age, they are more common in children and adolescents.
Key Differences from Epidermoid Cysts
It's crucial to distinguish pilomatricomas from epidermoid cysts. While both appear as bumps under the skin, pilomatricomas:
- Are more likely to be firm due to calcification.
- Arise from hair matrix cells, while epidermoid cysts originate from hair follicle lining cells.
What to Do
If you notice a lump under your skin that feels like a pebble, it is essential to have it evaluated by a medical professional. While pilomatricomas are benign, proper diagnosis ensures the correct treatment path.
