Melanoma Signs & Symptoms
Melanoma is a serious form of skin cancer that develops when pigment-producing skin cells, called melanocytes, change (mutate) and become cancerous. Recognizing the potential melanoma symptoms and warning signs supports earlier evaluation and treatment.
Key Takeaways
- The ABCDE guide (Asymmetry, Border, Color, Diameter, Evolving) is the most widely used way to check moles for possible melanoma symptoms.
- Melanoma can appear as a brand-new spot or as a change in an existing mole, and not every melanoma looks dark or uneven — some have little or no color at all.
- It can also develop in less common places, such as under the nails, on mucous membranes, and in the eye, which has its own distinct warning signs.
- Any mole that changes, bleeds, itches, or doesn’t heal is worth a prompt visit to a doctor or dermatologist.
- Monthly skin self-exams, along with regular professional checks, support early detection of melanoma — especially for people with more moles or a family history of the disease.
Key Melanoma Symptoms to Watch For
Recognizing the symptoms of melanoma often starts with paying attention to changes on your skin. Most moles are harmless, but certain features can point to a higher risk of melanoma. Learning how to identify melanoma means knowing the visual cues that separate a concerning lesion from an ordinary one.
The ABCDEs of Melanoma Detection
The ABCDE guide is the most widely used way to check moles and pigmented spots for features that could signal melanoma:
- A – Asymmetry: one half of the mole does not match the other half.
- B – Border: the edges are irregular, notched, or blurred.
- C – Color: the coloring is inconsistent, mixing tan, brown, or black with patches of white, red, or blue in the same spot.
- D – Diameter: melanomas are typically bigger than a pencil eraser (roughly 6 millimeters across) by the time they’re found, though a melanoma can still be smaller than that.
- E – Evolving: the mole’s size, shape, or color shifts over time, or it starts bleeding, crusting, or itching.
Some clinicians also describe an “ugly duckling” sign: a mole that looks distinctly different from the other moles nearby is worth having checked, even if it doesn’t clearly meet the ABCDE criteria.
What Does Melanoma Look Like?
Melanoma doesn’t always look the same, so there’s no single description that fits every case of what does melanoma look like. It’s often a new, unusual growth or a change in an existing mole. While many melanomas are dark brown, black, or blue, others are pink, red, or skin-colored, and some have little or no visible pigment at all, sometimes called amelanotic melanoma. The surface can be smooth, scaly, or raised. Photos can help you know what to look for, but a professional skin exam is needed for an actual diagnosis.
Early Warning Signs on Your Skin
Beyond the ABCDE guide, other changes on the skin can be early melanoma warning signs and deserve attention during regular self-exams.
New Moles and Changing Lesions
A new mole, or a noticeable change in an existing one, is a meaningful warning sign. Changes can include growth in size, a shift in color, or a change in texture. A mole that starts to itch, bleed, or feels tender without an obvious injury should also be evaluated promptly. Doctors also look out for satellite moles, meaning additional small moles that pop up close to an existing one. These subtle shifts can be among the earliest melanoma symptoms, prompting the question, “is my mole melanoma?”
Unusual Growths and Sores
Melanoma doesn’t always look like a typical mole. It can appear as a sore that doesn’t heal, a bump that grows quickly, or a lesion that feels firm or raised. Any new, growing, or changing skin lesion — particularly one that oozes, bleeds, or ulcerates — should be examined by a doctor. These less typical presentations are part of the broader range of symptoms of melanoma skin cancer.
Melanoma Beyond Common Moles
While most people associate melanoma with moles on sun-exposed skin, this cancer can also develop in other, less obvious places, with its own set of melanoma symptoms.
Nail, Eye, and Mucosal Melanoma
Melanoma can occur in areas that get little sun exposure. Acral lentiginous melanoma, the least common of the main melanoma types, usually develops on the palms, the soles, or under the fingernails or toenails. Melanoma can also affect mucous membranes, the moist tissue lining areas such as the mouth, nose, or genital area; this form is addressed together with skin melanoma in national treatment guidance. Melanoma can also arise in the eye. Eye (ocular) melanoma is a distinct condition with its own risk factors, warning signs, and screening approach, and it is covered separately from the skin-focused guidance on this page.
Symptoms of Advanced Disease
If melanoma isn’t caught early, it can spread beyond the skin, most often reaching nearby lymph nodes first and, in some cases, other organs such as the lung, liver, or brain. Symptoms then depend on where the cancer has spread — for example, shortness of breath if it reaches the lungs, or headache, dizziness, or seizures if it reaches the brain. Because melanoma doesn’t always cause obvious symptoms until it has spread, the ABCDE checks and regular skin exams described here remain the main way to catch it early; how stage and spread affect outlook is covered in more detail elsewhere.
Is My Mole Melanoma? Self-Check Guide
Checking your skin regularly is one of the most effective things you can do for early detection. Understanding how to identify melanoma through self-exams can help you seek medical advice sooner. If you’re wondering, “is my mole melanoma?”, a systematic approach to skin checks is a good first step.
Performing Regular Skin Self-Exams
It’s generally recommended to do a full skin self-exam about once a month. Use a full-length mirror and a hand-held mirror to check hard-to-see areas such as your back, scalp, and the soles of your feet. Look for new moles, moles that are changing, or any spot that stands out from the others on your skin, sometimes called the “ugly duckling” sign. Keeping track of your moles, including with photos, can make it easier to notice changes over time and spot concerning melanoma warning signs on skin.
When to Seek Professional Advice
If you notice any of the ABCDE signs, a new or changing mole, or a lesion that bleeds, itches, or is painful, it’s worth having it checked by a doctor or dermatologist rather than waiting to see if it changes. A clinician can examine the area and, if needed, order a biopsy to check the tissue for cancer. People with more moles, a history of blistering sunburns, or a family history of melanoma may benefit from more frequent professional skin checks; a doctor can advise on how often that should be.
Frequently Asked Questions
What are the primary indicators of melanoma?
The primary indicators are usually summarized by the ABCDE rule: an asymmetrical shape, an irregular border, inconsistent color, a diameter typically around 6 millimeters or more, and a mole that keeps evolving in size, shape, or symptoms. A new or changing mole, or one that bleeds or itches, should also raise suspicion and prompt a medical evaluation.
Can melanoma appear in areas not exposed to the sun?
Yes. Melanoma can develop on the soles of the feet, the palms of the hands, under the fingernails or toenails, on mucous membranes such as the mouth or genital area, and in the eye. These less common forms can be easy to overlook, so it’s worth mentioning any changes in these areas during a skin exam.
How often should I check my skin for melanoma?
A thorough self-exam about once a month is generally recommended, so you become familiar with your skin and can catch new or changing spots early. A doctor can advise on how often you should also have a professional skin exam, especially if you have more moles or other risk factors for melanoma.
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