Merkel Cell Carcinoma vs Basal Cell Carcinoma

How to tell the difference — key features compared side by side.

Feature
Merkel Cell Carcinoma
Basal Cell Carcinoma
Category
Malignant
Malignant
Key feature
Rare but highly aggressive. Appears as a painless, fast-growing, firm nodule - often flesh-colored or bluish-red.
The most common cancer in humans. Slow-growing, rarely spreads, but can cause serious tissue damage if untreated.
Risk factors
Age over 50 (median age at diagnosis is 76); Chronic sun exposure on fair skin; Weakened immune system (transplant, HIV, chronic lymphocytic leukemia)
Chronic cumulative sun exposure over many years (outdoor workers, sun-seekers); Fair skin, light hair, light eye color (Fitzpatrick types I-III); Age over 50, though increasingly diagnosed in younger adults
Action needed
A rapidly growing, painless, firm nodule on sun-exposed skin
A pearly, shiny, or translucent bump - especially with tiny visible blood vessels

Merkel Cell Carcinoma

Merkel cell carcinoma is a rare and aggressive neuroendocrine skin cancer that develops in Merkel cells, which are sensory cells located near nerve endings in the skin. It is approximately 40 times rarer than melanoma but has a higher mortality rate stage-for-stage.

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Basal Cell Carcinoma

Basal cell carcinoma (BCC) is the single most common form of cancer worldwide, with an estimated 3.6 million cases diagnosed annually in the United States alone. It arises from basal cells in the deepest layer of the epidermis.

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Does yours look more like merkel cell carcinoma?

Quick self-check

Does this look like merkel cell carcinoma? Answer 2 questions.

Is the nodule firm, dome-shaped, and painless?

Has it grown rapidly (weeks rather than months)?

Still not sure?

Our full ABCDE checker evaluates 5 clinical criteria dermatologists use.

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