How do I know if I have Skin Cancer?

TL;DR: Skin cancer is primarily identified through changes in the size, shape, or color of existing moles, or the appearance of new, unusual growths that do not heal. If you notice a spot that evolves over weeks or months, it is essential to have it evaluated by a dermatologist to determine if further testing is required.

What are the early signs of skin cancer?

While many skin spots are benign, identifying skin cancer early significantly improves treatment outcomes. The most common warning signs involve changes to your skin’s appearance. You should pay close attention to any spot that develops an irregular border, multiple colors, or a diameter larger than a pencil eraser (6mm). In our DiseaseMaps community, 34 people with skin cancer have shared their experiences, often noting that their diagnosis began with a lesion that simply "looked different" from the rest of their skin.

How can I perform a self-assessment for skin cancer?

Regular skin self-exams are the best way to catch skin cancer in its early stages. Use the "ABCDE" rule to evaluate your moles:

• Asymmetry: One half of the mole does not match the other.


• Border: The edges are ragged, notched, or blurred.


• Color: The spot has inconsistent shades of brown, black, tan, red, or blue.


• Diameter: The spot is larger than 6mm (about the size of a pencil eraser).


• Evolving: The lesion is changing in size, shape, or color over time.

When should I seek urgent medical evaluation?

You should seek a professional consultation if you notice a sore that does not heal within four weeks, a spot that bleeds or crusts repeatedly, or a new growth that feels itchy or painful. If your doctor dismisses a concern, it is your right to advocate for yourself. You can say, "I am concerned about this specific lesion because it is changing; could we perform a skin biopsy to be certain, or can you provide a referral to a dermatologist for a dermoscopy?"

What diagnostic tests are used for skin cancer?

A dermatologist will typically use a dermatoscope to examine the lesion at a high magnification. If the lesion appears suspicious, the gold standard for diagnosis is a skin biopsy, where a small sample of the tissue is removed and sent to a pathologist for analysis. This is the only way to definitively confirm a diagnosis of skin cancer.

Next steps

• Schedule an annual full-body skin exam with a board-certified dermatologist.


• Document any suspicious spots with clear, dated photographs to track changes over time.


• Join the 34 members of the DiseaseMaps.org community to share experiences and find local support.

Medical disclaimer: This information is for educational purposes and does not replace professional medical advice, diagnosis, or treatment.

References

• American Academy of Dermatology (AAD): Skin Cancer Prevention and Detection.


• National Cancer Institute (NCI): Skin Cancer Information.


• NIH Genetic and Rare Diseases Information Center (GARD): Skin Cancer Resources.


• Skin Cancer Foundation: Early Detection Guidelines.