Skin Self-Examination Guide: How to Check Your Skin for Melanoma Every Month

The Bottom Line

Patients who regularly check their own skin find melanoma at significantly earlier stages—with a median tumor thickness of 0.6-1.0 mm compared to 1.5-2.5 mm for tumors found only at doctor visits. That difference in thickness translates to a 10-year survival rate of 85-90% versus 75-80%. A thorough monthly self-exam paired with professional dermatology visits is one of the most effective things you can do for your long-term skin health.

Why Skin Self-Examination Saves Lives

You live in your skin 24 hours a day. You have the unique ability to notice changes as they happen—long before your next annual dermatology appointment. Research clearly shows that self-examination works:

  • People who regularly self-examine detect melanoma at a median Breslow depth (tumor thickness) of 0.6-1.0 mm—significantly thinner than the 1.5-2.5 mm average for clinically detected cases
  • Stage IA melanoma (thinnest, less than 0.8 mm) has a 10-year survival rate over 95%
  • Stage IIC melanoma (thicker) has only a 40% 10-year survival rate
  • Regular self-examinations are associated with 15-25% improvement in melanoma-specific survival compared to unscreened populations

It's important to be realistic, though: self-examination has limits. About 30% of melanomas develop on areas that are very hard to see yourself (your back, scalp, between the buttocks). Your unaided eye detects melanoma about 40-60% of the time compared to 90-95% accuracy with dermoscopy by a trained dermatologist. Self-exams are a vital complement to professional care—not a replacement for it.

Who Should Do Monthly Self-Exams?

Monthly self-examination is especially important if you have:

  • A personal history of melanoma (you have a 10-40% risk of developing another melanoma)
  • A first-degree relative (parent, sibling, child) with melanoma
  • 5 or more atypical (irregular-looking) moles—these individuals have a 10-40% lifetime risk of melanoma
  • Fair skin that burns easily (Fitzpatrick type I or II)
  • A history of significant sun exposure or repeated sunburns, especially as a child

If you have a family history but fewer other risk factors, every 3 months is appropriate. Low-risk individuals should self-examine at least annually. Whatever your risk level, commit to a consistent schedule.

Understanding the ABCDE Warning Signs

The ABCDE mnemonic describes the features most commonly seen in melanoma. Use these criteria when evaluating any spot during your exam:

A – Asymmetry: Draw an imaginary line through the center of the lesion. If the two halves look clearly different from each other, that is asymmetry. Benign moles are usually round and symmetrical on all axes.

B – Border: Look at the edge of the lesion. Melanoma borders tend to be irregular, scalloped, notched, or blurry rather than smooth and distinct. It may look like the edge is not well-defined or is hard to trace cleanly.

C – Color: A benign mole is typically one shade of brown. Melanoma often displays multiple shades—tan, dark brown, black, red, pink, and even white or blue—all within a single lesion. Color variation is a meaningful warning sign.

D – Diameter: Melanomas are often larger than 6 mm (the size of a pencil eraser) at the time of diagnosis. However, approximately 25-30% of melanomas are smaller than 6 mm when found, so do not dismiss a lesion just because it seems small. Size alone is less important than change.

E – Evolution: This is often the most important feature. Any mole that is changing—growing larger, getting darker or lighter, changing shape, beginning to itch, bleed, or crust—demands evaluation. Stable moles stay stable. Melanoma changes.

Add to these the “ugly duckling sign”: any mole that looks distinctly different from all your others deserves attention, even if it does not technically meet ABCDE criteria.

How to Perform a Thorough Self-Exam

Plan for 15-30 minutes in a warm, private room with bright lighting. You will need a full-length mirror, a handheld mirror, and a comb or part-comb for the scalp.

1. Face, Ears, Scalp, and Neck

Start at the top of your body. In front of the full mirror, examine your face thoroughly: forehead, nose, cheeks, lips, and chin. Check both sides of your ears and the skin behind them. Use the comb to systematically part your hair in sections and examine every area of your scalp—under the hair, along the hairline, and at the crown. Finish with your neck, front and back.

2. Arms and Hands

Examine your arms from shoulder to wrist on all sides—front, back, and both sides. Pay attention to elbows. Look carefully at your hands, both palms and backs. Spread your fingers to see the skin between them. Check under your fingernails—a dark vertical stripe under a nail can occasionally represent subungual (under-nail) melanoma.

3. Trunk (Chest and Abdomen)

Facing the mirror, check your chest and abdomen. Women should lift their breasts to examine the skin underneath. Check your armpits carefully—melanoma can occur in any skin fold.

4. Back, Shoulders, and Buttocks

This is the hardest area to examine. Use the handheld mirror in front of the full mirror to see your back. Start at the shoulders and work your way down to the lower back. Examine your buttocks. Consider enlisting a partner or family member to help with your upper back—this is where many melanomas are found late precisely because people can't see it themselves.

5. Legs and Feet

Sit down for this part. Examine the fronts, backs, and sides of your thighs. Continue down your lower legs. Look at the soles of your feet carefully—acral lentiginous melanoma, a type that occurs on palms and soles, is often diagnosed late because these areas are overlooked. Check between every toe and under your toenails.

6. Genital and Perianal Area

Use the handheld mirror. About 5-10% of melanomas occur in the genital and perianal regions. Include these areas in your comprehensive exam.

Tracking Your Moles: Documentation That Works

Memory is unreliable when it comes to subtle changes in mole appearance. Documentation makes self-exams dramatically more effective:

  • Smartphone photography: Take photos of moles you want to monitor. Keep consistent distance, lighting, and angle. Include a ruler or coin for scale. Store photos with the date.
  • Written notes: A simple record (e.g., “right upper back mole – 5 mm, brown, symmetric, stable”) gives you a baseline to compare at future exams.
  • Monthly comparison: At each exam, pull up last month's photos and compare side by side. Subtle changes become obvious this way.

When to Call Your Dermatologist

  • A new mole or spot appeared since your last exam
  • An existing mole has changed in size, shape, or color
  • A spot itches, bleeds, crusts, or oozes without injury
  • A lesion meets 2 or more ABCDE criteria
  • You have a gut feeling that something doesn't look right—trust it
  • A mole is growing rapidly (doubling in size over weeks to months)

Don't wait months if something concerns you. Most dermatology practices can accommodate urgent appointments for potentially suspicious lesions. The worst outcome of a biopsy that turns out benign is a small scar and peace of mind. The worst outcome of waiting is a delayed melanoma diagnosis.

Frequently Asked Questions

How often should I perform skin self-examination?

Monthly self-examination is the standard recommendation for individuals at high risk: those with a personal history of melanoma, a family history of melanoma, or 5 or more atypical moles. Every 3 months is appropriate for moderate risk, and annually is a reasonable minimum for everyone else. Mark your calendar—the consistency of the habit matters more than occasional intensive checks.

I found a mole that looks different. Do I have melanoma?

Not necessarily—many benign moles look irregular. The ABCDE criteria raise suspicion but do not confirm diagnosis. Only a dermatologist with dermoscopy (and sometimes a biopsy) can tell you definitively. What you have found is a reason to make an appointment, not a reason to assume the worst. Most biopsied lesions turn out to be benign or mildly atypical (dysplastic nevi), not melanoma.

Do I need to see a dermatologist if I do self-exams?

Yes. Self-examination and professional screening are complementary, not interchangeable. You cannot see about 30% of your skin surface accurately on your own. Dermatologists have dermoscopy, which improves diagnostic accuracy to 90-95%—far beyond what the naked eye can achieve. Combine monthly self-exams with annual professional screenings (or every 3-6 months if you are high-risk).

Should I be worried about moles I've had for years?

Long-standing stable moles are generally less concerning than new or evolving ones. However, melanoma can arise from a previously stable mole that suddenly begins to change. The critical thing to watch for is change—if a mole you've had for 20 years suddenly starts growing or darkening, that change warrants evaluation even if the mole looked perfectly normal before.

References

  1. Friedman RJ, Rigel DS, Kopf AW. Early detection of malignant melanoma: the role of physician examination and self-examination. CA Cancer J Clin. 1985;35(3):130-151.
  2. Abbasi NR, Shaw HM, Rigel DS, et al. Early diagnosis of cutaneous melanoma: revisiting the ABCDE criteria. JAMA. 2004;292(22):2771-2776.
  3. Rigel DS, Friedman RJ, Kopf AW, et al. ABCDE rule for the identification of high-risk melanomas. Dermatol Surg. 2015;41(6):653-659.
  4. Kittler H, Pehamberger H, Wolff K, Binder M. Diagnostic accuracy of dermoscopy. Lancet Oncol. 2002;3(3):159-165.
  5. Balch CM, Gershenwald JE, Soong SJ, et al. Final version of the American Joint Committee on Cancer staging system for cutaneous melanoma. J Clin Oncol. 2001;19(16):3622-3634.
  6. Swetter SM, Tsao H, Bichakjian CK, et al. Guidelines of care for the management of primary cutaneous melanoma. J Am Acad Dermatol. 2019;80(1):208-250.

Trusted Resources

Always consult a board-certified dermatologist for personalized guidance on skin cancer risk assessment and evaluation of any suspicious lesions.