Is melanoma a type of skin cancer?

Aug 31, 2026 Source: Cainiu Health

Dr. Liu Wenmin

Introduction

Melanoma is a type of skin cancer and represents a highly malignant skin tumor, distinct from common basal cell carcinoma and squamous cell carcinoma. It progresses rapidly and readily metastasizes systemically, resulting in a poorer prognosis. Any morphological changes in a pigmented nevus (e.g., asymmetry, irregular borders, color variation, diameter increase, or evolving appearance) or recurrent ulceration warrants prompt medical evaluation for diagnosis.

　　Melanoma is a type of skin cancer and a highly malignant skin tumor, distinct from common basal cell carcinoma and squamous cell carcinoma. It progresses rapidly and readily metastasizes systemically, resulting in a poorer prognosis. Any morphological changes in a skin mole—such as irregular shape, repeated ulceration—warrant prompt medical evaluation and diagnostic workup.

　　Skin cancer encompasses multiple histopathological subtypes, among which melanoma represents the most aggressive variant, arising from malignant transformation of melanocytes in the skin. In contrast, most non-melanoma skin cancers grow locally and progress slowly, with relatively low metastatic potential. Melanoma cells proliferate and disseminate more rapidly, capable of invading lymphatic tissues and internal organs; thus, disease progression far outpaces that of common skin malignancies, rendering melanoma one of the most life-threatening cutaneous malignancies.

　　Clinically, surgical excision is the first-line treatment for melanoma. Complete removal of the lesion at an early stage effectively halts disease progression. When the tumor has become invasive or metastatic, adjuvant targeted therapy and/or immunotherapy are required to control further lesion development. Regular skin screening, vigilant monitoring for abnormal changes in moles, and timely intervention are essential to prevent disease progression.

　　In daily life, comprehensive skin protection is crucial: avoid intense sun exposure and repeated mechanical irritation (e.g., friction) of moles; maintain stable immune function; and perform routine self-examinations of the entire skin surface to reduce the risk of melanocytic malignant transformation.

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Can a PET-CT scan detect skin cancer?

If only the primary tumor on the skin surface needs to be diagnosed, PET-CT is usually not the first choice. Primary lesions of skin cancer often present as superficial abnormalities such as masses or plaques, which can be accurately diagnosed through visual inspection, dermoscopy, and pathological biopsy. PET-CT is not only more costly, but also less precise than specialized examinations in detecting small, superficial lesions. Indiscriminate use may lead to unnecessary resource waste.

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What medication is effective for early-stage skin cancer?

Effective medications for early-stage skin cancer generally include imiquimod cream, tretinoin cream, fluorouracil cream, calcipotriol ointment, and recombinant human interferon α2b ointment. Imiquimod cream works by activating the local immune response to target tumor cells, and is suitable for superficial basal cell carcinoma, actinic keratosis, and other early lesions; it should be applied according to the prescribed treatment course.

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What are the differences between early-stage skin cancer and other skin conditions?

Differences between early-stage skin cancer and other skin conditions generally include lesion morphology stability, border and color characteristics, associated symptoms, and differences in healing capacity. Early-stage skin cancer lesions are often unstable and gradually change over time, such as expanding in size, altering in shape, or even developing ulceration and crusting. In contrast, lesions from other skin conditions like eczema or dermatitis tend to remain relatively stable in appearance.

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Can skin cancer be detected through early physical examination?

In general, whether early-stage skin cancer can be detected through a physical examination depends on the specific methods used during the体检 and the individual patient's circumstances. If any discomfort is present, timely medical consultation is recommended. It is also important to regularly monitor changes in the skin. If new rashes persist for a long time, existing moles rapidly increase in size or change color, or skin ulcers fail to heal over time, prompt medical evaluation is advised.