Know the Signs: A Patient's Guide to Recognizing Melanoma

This guide walks through what melanoma is, the symptoms to watch for, two memorable tools dermatologists use to identify suspicious spots (the ABCDEs and the "Ugly Duckling" sign), and when it's time to make an appointment.

What Is Melanoma?

Melanoma is a cancer that begins in the melanocytes, the cells that give your skin its color. It can develop anywhere on the body, including areas that rarely see the sun, like the soles of the feet, between the toes, under fingernails, on the scalp, or even in the eyes. While melanoma accounts for only about 1% of skin cancers, it causes the majority of skin cancer deaths because it can spread quickly to other parts of the body if left untreated.

The encouraging news is that melanoma found early, while it is still confined to the top layer of skin, is highly curable. That's why knowing what to look for matters so much.

The ABCDEs of Melanoma

Dermatologists rely on a simple checklist called the ABCDEs to help patients evaluate their moles and spots. Each letter represents a feature that, on its own or in combination, may signal a problem.

A is for Asymmetry. Most healthy moles are symmetrical: if you drew a line through the middle, the two halves would match. A melanoma is more likely to have two halves that look different from each other.

B is for Border. Benign moles tend to have smooth, even edges. Melanomas often have borders that are irregular, ragged, notched, or blurred.

C is for Color. A normal mole is usually a single shade of brown. Melanomas may contain multiple colors in the same spot, including different shades of brown, black, tan, red, white, or even blue.

D is for Diameter. Melanomas are often larger than 6 millimeters across, roughly the size of a pencil eraser, although they can be smaller when first detected. Any growing spot deserves attention regardless of size.

E is for Evolving. This is one of the most important signs. A mole that is changing in size, shape, color, or texture, or one that begins to itch, bleed, or crust, should be evaluated by a dermatologist.

The Ugly Duckling Sign: Trust Your Eye

The ABCDEs are powerful, but they don't catch every melanoma. That's where the "Ugly Duckling" sign comes in, and it may be the easiest tool of all.

The idea is simple: most of the moles on your body tend to look like one another, almost like siblings in a family. They may differ slightly in size or shade, but they share a similar overall appearance. A melanoma, in contrast, often stands out as the "ugly duckling" in the group. It looks different from its neighbors, whether that means it's darker, lighter, larger, smaller, raised when others are flat, or simply not quite right.

Your eye is remarkably good at picking up on these differences, often before you can articulate why a spot bothers you. If a mole catches your attention every time you see it in the mirror, or a friend or family member points out a spot that looks unusual, take that instinct seriously. The Ugly Duckling sign is especially useful for spotting melanomas that don't fit neatly into the ABCDE checklist, including amelanotic melanomas (those that lack typical pigment) and small early lesions.

Other Symptoms to Watch For

Beyond moles, melanoma can show up in less obvious ways. Be alert for any of the following:

A sore that doesn't heal within a few weeks. A spot that bleeds, oozes, or develops a scaly crust. A new dark streak under a fingernail or toenail that wasn't there before. Persistent itching, tenderness, or pain in a specific area of skin. A change in the surface of a mole, such as bleeding, scaliness, or the appearance of a bump.

Melanoma is sometimes called the "great pretender" because it can mimic harmless conditions. When in doubt, get it checked.

Who Is at Higher Risk?

While anyone can develop melanoma, certain factors raise the risk. These include fair skin, light eyes, or red or blond hair; a history of sunburns, especially blistering sunburns in childhood; frequent use of tanning beds; a personal or family history of melanoma; having many moles (more than 50) or atypical moles; and a weakened immune system.

If you fall into one or more of these categories, regular skin checks become even more important.

How to Check Your Skin at Home

Plan to do a head-to-toe self-exam once a month in a well-lit room. Use a full-length mirror and a hand mirror to inspect hard-to-see areas like your back, the back of your neck, your scalp (a comb or hair dryer helps), the soles of your feet, between your toes, and under your nails. Take photos of moles you want to monitor so you can track changes over time. If something looks new, different, or simply doesn't feel right, write it down and bring it up at your next appointment.

When to See a Dermatologist

Self-checks are a great first line of defense, but they are not a substitute for a professional skin exam. Most adults benefit from an annual full-body skin check, and people at higher risk may need to be seen more often. Schedule an appointment promptly if you notice any of the following: a new mole or spot in adulthood, a mole that is changing, a spot that fits one or more of the ABCDE criteria, an "ugly duckling" that doesn't match the rest of your moles, or any sore that fails to heal.

A dermatologist can examine the spot in person, often using a tool called a dermatoscope to magnify the skin, and recommend a biopsy if needed. Most suspicious spots turn out to be harmless, but on the rare occasion they don't, early diagnosis can be lifesaving.

Schedule Your Skin Check Today

At Specialists in Dermatology, our board-certified dermatologists are here to help you stay ahead of skin cancer with thorough, compassionate, and expert skin exams. Whether you've spotted something that concerns you, or you're simply due for your annual check, we're ready to see you.

Don't wait on a spot that's worrying you. Call our office at (520) 382 - 3330 or click the book appointment button today, and give yourself peace of mind.