Merkel cells are small, oval‑shaped skin cells that sit at the very bottom of the epidermis (the stratum basale), usually near nerve endings.

What a normal Merkel cell looks like

Under a microscope, a Merkel cell typically appears as:

  • A clear or pale , oval‑shaped cell about 10 micrometers in diameter.
  • Located in the lower epidermis or at the dermo‑epidermal junction, often in touch‑sensitive areas like fingertips.
  • Closely associated with a sensory nerve ending, forming a Merkel cell–neurite complex (a “touch receptor” unit).

Electron‑microscopy images show Merkel cells with dense‑core cytoplasmic granules , reflecting their neuroendocrine character.

How they differ from Merkel cell carcinoma

When these cells turn cancerous (Merkel cell carcinoma), the tissue looks very different:

  • Tumors form firm, shiny nodules that are flesh‑colored, red, blue, or violaceous (purple‑red).
  • Under the microscope, MCC shows small, round or oval tumor cells with scant cytoplasm , “salt‑and‑pepper” chromatin, and many mitoses.

If you’re asking because of a skin lesion, any new, fast‑growing, or unusual bump should be checked by a dermatologist , since Merkel cell carcinoma is rare but aggressive.

Information gathered from public forums or data available on the internet and portrayed here.