How Is Melanoma Diagnosed?

If a mole or skin spot looks concerning, a dermatologist will usually do a few things:

• Visual check: They’ll use a special device called a dermatoscope to closely inspect the spot.
• Skin biopsy: This is the only way to confirm melanoma. A sample of the skin is taken and looked at under a microscope.
• Histopathology: This analysis looks at key features of the tumor, such as:
  – Breslow thickness (how deep the tumor is),
  – Whether there’s ulceration,
  – The mitotic rate, or how fast cells are dividing.

If advanced melanoma is suspected, imaging tests might be needed:

• Ultrasound or CT scans: To see if nearby lymph nodes or organs are affected.
• PET or MRI scans: These help detect spread to distant organs.
• Sentinel lymph node biopsy: A surgical test to see if cancer has reached nearby lymph nodes.

Stages of Melanoma

Melanoma is staged from Stage 0 (very early) to Stage IV (advanced), depending on how far it has spread.

• Stage 0 (in situ): The cancer is only in the top skin layer. Very treatable with surgery.
• Stage I–II: The tumor is thicker and possibly ulcerated, but hasn’t spread. Risk rises with size and depth.
• Stage III: The cancer has reached nearby lymph nodes or skin.
• Stage IV: It has spread to distant organs—like the lungs, liver, brain, or other parts of the skin.

Doctors use a system called AJCC TNM to describe melanoma:

• T = Tumor (size and depth)
• N = Node (lymph node involvement)
• M = Metastasis (spread to distant parts of the body)

Melanoma Prognosis

Your outlook depends a lot on how early the melanoma is found:

• Stage 0 & I: Great outcomes—over 90–99% 5-year survival rate.
• Stage II: Still treatable, but survival drops to around 70–85%.
• Stage III: Moderate prognosis, with survival rates between 40–78%, depending on how many lymph nodes are affected.
• Stage IV: More serious, but thanks to newer treatments like immunotherapy and targeted drugs, some people are now living much longer and even achieving remission.

Prevention & Early Detection Tips

Melanoma may be aggressive, but it’s also one of the most preventable cancers. Here’s how to reduce your risk:

• Stay out of the sun during peak hours (10 a.m. to 4 p.m.).
• Wear hats, long sleeves, and sunglasses.
• Use sunscreen (SPF 30 or higher), and reapply every two hours.
• Avoid tanning beds.
• Do regular self-checks—use mirrors to look over your whole body once a month.
• See a dermatologist regularly, especially if you’re high-risk.