About this article
Medically reviewed- Written by
- Dr Paul Watson
- Medically reviewed by
- Dr Han Simpson
- Published
- June 1, 2026
- Medical review date
- September 8, 2026
- Evidence searched through
- September 8, 2026
- Next review due
- September 8, 2027
- Intended audience
- General Readers & Patients
- Geographic scope
- Worldwide
- Conflicts of interest
- None declared.
- Funding
- Website Owner
- Report a correction
- Report an error or editorial concern
- Medical disclaimer
- Read the medical disclaimer
If you’re searching for pictures of Merkel cell carcinoma, you’re likely trying to determine whether a suspicious skin growth resembles this rare but aggressive form of skin cancer. Merkel cell carcinoma (MCC) often appears as a rapidly growing red, pink, purple, or flesh-colored bump that can easily be mistaken for a cyst, insect bite, pimple, or another type of skin cancer.
Although Merkel cell carcinoma is relatively uncommon, it is one of the most aggressive forms of skin cancer. Early recognition and prompt treatment can significantly improve outcomes. Reviewing pictures of Merkel cell carcinoma may help patients understand how these tumors appear during various stages of development and when medical evaluation is necessary.
In this doctor-reviewed guide, we’ll examine what Merkel cell carcinoma looks like, discuss common visual features, compare it to other skin conditions, and explain the warning signs that should never be ignored.
What Is Merkel Cell Carcinoma?
Merkel cell carcinoma is a rare neuroendocrine skin cancer that develops from Merkel cells, specialized cells found near nerve endings within the skin.
The cancer is strongly associated with:
- Excessive ultraviolet (UV) exposure
- Advanced age
- Fair skin
- Weakened immune systems
- Organ transplantation
- Chronic lymphocytic leukemia
- Merkel cell polyomavirus infection
Although less common than melanoma, basal cell carcinoma, or squamous cell carcinoma, Merkel cell carcinoma tends to grow and spread much more quickly.
Pictures of Merkel Cell Carcinoma: Typical Appearance
When reviewing Merkel cell carcinoma pictures, several common characteristics frequently appear.
Most lesions are:
- Firm
- Dome-shaped
- Smooth surfaced
- Painless
- Rapidly growing
- Red, pink, purple, blue-red, or flesh-colored
Unlike squamous cell carcinoma, Merkel cell carcinoma often lacks obvious scaling or crusting during its early stages.
Common Colors Seen in Merkel Cell Carcinoma Pictures
The color can vary significantly.
Pictures commonly show lesions that are:
| Color | Frequency |
|---|---|
| Pink | Common |
| Red | Common |
| Purple | Common |
| Blue-red | Less common |
| Flesh-colored | Common |
Because the tumor often develops beneath the skin, the lesion may appear shiny or translucent.
Early Merkel Cell Carcinoma Pictures
Early Merkel cell carcinoma can be surprisingly subtle.
Many patients initially mistake the lesion for:
- A pimple
- A bug bite
- A cyst
- An ingrown hair
- A benign skin bump
Early Merkel cell carcinoma pictures often reveal:
| Feature | Appearance |
| Size | Less than 1 cm |
| Shape | Round or dome-shaped |
| Texture | Firm |
| Surface | Smooth |
| Pain | Usually absent |
| Growth | Rapid |
One of the most important clues is how quickly the lesion enlarges.
Many patients report noticeable growth over several weeks.
Merkel Cell Carcinoma Pictures by Body Location
Merkel Cell Carcinoma Pictures on the Face
The face is one of the most common locations.
Pictures often show lesions on:
- Forehead
- Nose
- Cheeks
- Eyelids
- Temples
Facial tumors frequently appear as shiny pink or purple nodules.
Merkel Cell Carcinoma Pictures on the Scalp
Scalp lesions are often discovered during haircuts.
Pictures may reveal:
- Smooth nodules
- Hair loss around the lesion
- Red or flesh-colored growths
Merkel Cell Carcinoma Pictures on the Arms
Sun-exposed areas of the arms are common sites.
Pictures often demonstrate:
- Firm raised bumps
- Rapid enlargement
- Purple or red discoloration
Merkel Cell Carcinoma Pictures on the Legs
Although less common, Merkel cell carcinoma can occur on the legs.
Pictures may show:
- Round nodules
- Red-purple coloration
- Fast growth
Merkel Cell Carcinoma Pictures by Stage
Stage 1 Merkel Cell Carcinoma Pictures
Stage 1 disease remains confined to the skin.
Pictures often show:
- A single lesion
- Minimal surrounding inflammation
- Smooth skin surface
Stage 2 Merkel Cell Carcinoma Pictures
As tumors enlarge:
- Growth becomes more obvious
- Diameter increases rapidly
- Surface tension becomes more visible
Pictures may show larger nodules with more pronounced coloration.
Stage 3 Merkel Cell Carcinoma Pictures
When lymph nodes become involved:
- Swollen lymph nodes may develop
- Additional nodules may appear nearby
Pictures can reveal visible swelling around the primary tumor site.
Stage 4 Merkel Cell Carcinoma Pictures
Advanced disease may spread to:
- Liver
- Lungs
- Bones
- Brain
Skin pictures may show:
- Multiple nodules
- Ulceration
- Large tumor masses
Merkel Cell Carcinoma vs Cyst Pictures
Many patients searching for Merkel cell carcinoma pictures are actually concerned about a cyst.
Merkel Cell Carcinoma
- Firm
- Rapidly growing
- Red or purple
- Usually painless
Cyst
- Slow growing
- Often movable
- May contain a central pore
- Usually skin-colored
A rapidly enlarging lesion should never be assumed to be a simple cyst.
Merkel Cell Carcinoma vs Insect Bite Pictures
Early Merkel cell carcinoma is frequently mistaken for a bug bite.
Merkel Cell Carcinoma
- Persists for weeks
- Continues enlarging
- Usually painless
Insect Bite
- Itchy
- Improves over days
- Often accompanied by inflammation
Any “bite” that continues growing should be medically evaluated.
Merkel Cell Carcinoma vs Basal Cell Carcinoma Pictures
These cancers can appear similar.
| Merkel Cell Carcinoma | Basal Cell Carcinoma |
| Fast growing | Slow growing |
| Red or purple | Pearly |
| Firm | Waxy |
| Aggressive | Less aggressive |
Basal cell carcinoma rarely grows as rapidly as Merkel cell carcinoma.
Merkel Cell Carcinoma vs Squamous Cell Carcinoma Pictures
Merkel Cell Carcinoma
Often appears:
- Smooth
- Dome-shaped
- Shiny
Squamous Cell Carcinoma
Frequently appears:
- Scaly
- Crusted
- Ulcerated
- Rough
The absence of scaling may help distinguish Merkel cell carcinoma.
Merkel Cell Carcinoma vs Melanoma Pictures
Merkel Cell Carcinoma
Usually:
- Pink
- Purple
- Red
- Flesh-colored
Melanoma
Often:
- Brown
- Black
- Multicolored
However, some melanomas are amelanotic and may closely resemble Merkel cell carcinoma.
The AEIOU Signs of Merkel Cell Carcinoma
Dermatologists frequently use the AEIOU rule.
A – Asymptomatic
The lesion is often painless.
E – Expanding Rapidly
Growth occurs over weeks to months.
I – Immune Suppression
Risk increases with weakened immunity.
O – Older Than 50
Most patients are older adults.
U – UV-Exposed Skin
Tumors commonly develop in sun-exposed areas.
Most Merkel cell carcinoma patients exhibit at least three of these features.
Symptoms That May Accompany Merkel Cell Carcinoma
Although many lesions are painless, some patients experience:
- Skin tightness
- Mild tenderness
- Enlarged lymph nodes
- Fatigue (advanced disease)
- Swelling near the lesion
How Is Merkel Cell Carcinoma Diagnosed?
Diagnosis typically involves several steps.
Skin Examination
A dermatologist evaluates the lesion’s appearance.
Biopsy
A tissue sample is removed and examined under a microscope.
Immunohistochemistry
Special staining helps distinguish Merkel cell carcinoma from other cancers.
Imaging Studies
Your physician may order:
- PET scans
- CT scans
- MRI scans
These tests help determine whether the cancer has spread.
Treatment Options
Treatment depends on the stage of disease.
Surgery
The primary tumor is surgically removed.
Sentinel Lymph Node Biopsy
Nearby lymph nodes are tested for cancer spread.
Radiation Therapy
Often recommended after surgery.
Immunotherapy
Modern treatments include:
- Pembrolizumab
- Avelumab
- Nivolumab
These medications have dramatically improved outcomes for some patients with advanced disease.
Prognosis
The prognosis depends largely on:
- Tumor size
- Lymph node involvement
- Stage at diagnosis
- Overall health
Early-stage Merkel cell carcinoma generally has a significantly better outlook than advanced disease.
This is why recognition of suspicious lesions and prompt biopsy are critical.
When Should You See a Doctor?
Schedule an evaluation immediately if you notice:
- A rapidly growing skin bump
- A persistent red or purple nodule
- A lesion that doubles in size over weeks
- New lymph node swelling
- A skin growth that doesn’t heal
Rapid growth is one of the strongest warning signs associated with Merkel cell carcinoma.
Frequently Asked Questions
What does Merkel cell carcinoma look like?
Most lesions appear as smooth, firm, rapidly growing red, pink, purple, or flesh-colored nodules.
Is Merkel cell carcinoma painful?
Usually not. Most lesions are painless.
Can Merkel cell carcinoma look like a pimple?
Yes. Early lesions are commonly mistaken for pimples.
Can Merkel cell carcinoma be mistaken for a cyst?
Absolutely. Many patients initially believe they have a harmless cyst.
What color is Merkel cell carcinoma?
Lesions may appear pink, red, purple, blue-red, or flesh-colored.
How fast does Merkel cell carcinoma grow?
Many tumors enlarge noticeably within weeks to months.
Is Merkel cell carcinoma worse than melanoma?
Merkel cell carcinoma is generally considered one of the most aggressive skin cancers and often spreads earlier than melanoma.
Where does Merkel cell carcinoma usually occur?
The face, scalp, neck, and sun-exposed extremities are the most common locations.
What are the first signs of Merkel cell carcinoma?
A rapidly growing, painless skin nodule is often the first sign.
Is Merkel cell carcinoma curable?
When detected early and treated promptly, many patients achieve successful outcomes.
Final Thoughts
Reviewing pictures of Merkel cell carcinoma can help patients recognize one of the most aggressive forms of skin cancer. Typical lesions appear as rapidly growing, firm, painless red, pink, purple, or flesh-colored nodules that frequently occur on sun-exposed skin.
Because Merkel cell carcinoma can spread quickly, any suspicious lesion that continues growing should be evaluated by a dermatologist as soon as possible. Early diagnosis remains the most important factor in achieving the best possible outcome.