Between carcinomas and melanomas, skin cancers do not manifest in the same way. Some suspicious lesions do not resemble either a dark mole or an open wound, which delays diagnosis. Comparing warning signs according to the type of skin cancer helps to better target what justifies a consultation with a dermatologist.
Melanoma, basal cell carcinoma, and squamous cell carcinoma: compared warning signs
Not all skin cancers produce the same symptoms. Confusing a carcinoma with a trivial irritation or a melanoma with an ordinary mole remains common. The table below contrasts the three main forms based on their visible manifestations.
Further reading : Discover how to easily navigate using the sitemap of this beauty blog
| Criterion | Melanoma | Basal cell carcinoma | Squamous cell carcinoma |
|---|---|---|---|
| Initial appearance | Irregular pigmented spot, sometimes flesh-colored (amelanotic) | Small translucent, pearly, or pink bump | Rough, scaly plaque, sometimes crusty |
| Evolution | Rapid change in size, shape, or color | Very slow growth, occasional bleeding | Moderate growth, lesion that does not heal |
| Common location | Back, legs, exposed or unexposed areas | Face, neck, sun-exposed areas | Face, hands, forearms |
| Metastatic risk | High if detected late | Very low | Moderate (lymph nodes, distant organs) |
Basal cell carcinoma represents the most common and least aggressive form. In contrast, melanoma detected at an advanced stage remains the most dangerous of skin cancers, as it spreads quickly to other organs.
Identifying the precursor signs of skin cancer involves regular observation of the entire body, including areas rarely exposed to the sun.
You may also like : How to Make the Most of Your Monthly Beauty Box Subscription and Loyalty Program
Amelanotic melanoma and the ugly duckling sign: what the ABCDE method does not cover
The ABCDE rule (Asymmetry, Irregular Borders, Heterogeneous Color, Diameter greater than 6 mm, Evolution) remains a reference tool. However, it has concrete limitations when faced with certain forms of skin cancer.
Lesions without dark pigmentation
Amelanotic melanoma can be pink, red, or flesh-colored. It does not match the classic image of a dark spot. This type of lesion is often confused with a persistent pimple, a small wound, or irritation. Its deceptive appearance explains a frequently delayed diagnosis.
The ugly duckling sign
This principle is based on a simple logic: in the same patient, moles generally share a “family resemblance” in terms of size, shape, and color. A lesion that does not resemble any other on the body should raise concern, even if it does not meet all the ABCDE criteria.
This sign functions as a complementary filter. A mole may appear normal when viewed in isolation but become suspicious once compared to other lesions on the patient.
Actinic keratoses: the pre-cancerous lesion not to be trivialized
Even before a squamous cell carcinoma develops, the skin sometimes sends an intermediate signal. Actinic keratoses present as rough or scaly plaques related to chronic sun exposure. They appear on the face, scalp, ears, or backs of the hands.
These lesions are not yet cancerous, but they can evolve into a carcinoma if not addressed. The dermatologist treats them with cryotherapy, topical cream, or photodynamic therapy depending on their extent.
- Texture: area of skin that feels rough to the touch, like sandpaper, persisting for several weeks
- Color: often pink or reddish, sometimes barely visible on light skin
- Number: their presence in multiple instances in the same area increases the likelihood of progression to carcinoma
On dark skin, these lesions are more discreet. Location and texture matter as much as color for spotting them.
Non-healing lesion: the most underestimated warning sign
A scab that falls off and returns to the same spot, a superficial wound open for several weeks, a plaque treated as eczema without results: these situations justify a prompt dermatological opinion.
Any skin lesion that does not heal within three to four weeks should be re-evaluated. This persistence criterion despite treatment is particularly relevant for basal cell carcinomas, whose initial appearance may seem innocuous.
- A pimple that bleeds recurrently without an identified cause
- A crusty area that systematically reappears after apparent healing
- A pink or red plaque that resists usual dermatological treatments (moisturizing cream, topical corticosteroids)
This signal does not depend on the size or color of the lesion. It relies solely on the behavior of the skin over time, making it accessible to anyone performing regular self-examination.
Skin self-examination: frequency and forgotten areas
A quarterly self-examination covers most at-risk situations. It does not replace the annual consultation with a dermatologist, but it allows for spotting a change between visits.
The most neglected areas during self-examination are the scalp, spaces between the toes, the soles of the feet, and the nails. On dark skin, melanomas more often develop on the palms, soles, and under the nails, where natural pigmentation does not mask the lesion.
Photographing moles at regular intervals facilitates the detection of changes in shape, size, or color. This comparison over time remains the most reliable way to spot a suspicious evolution before it becomes concerning.
Early detection of skin cancer relies less on a single criterion than on the combination of several signals: unusual appearance, persistence, rapid evolution, difference from neighboring lesions. A visit to the dermatologist regarding a concerning lesion costs little compared to the benefit of an early diagnosis.