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The appearance and location of lesions can provide important clues in diagnosing the three main types of skin carcinomas: basal cell carcinoma, squamous cell carcinoma, and melanoma. Basal cell carcinoma typically appears as a pearly or waxy bump, often on sun-exposed areas, while squamous cell carcinoma may present as a firm, red nodule or a scaly patch in similar locations. Melanoma, on the other hand, often arises from moles or pigmented lesions and can appear anywhere on the body, characterized by asymmetry, irregular borders, and varied color. However, a definitive diagnosis usually requires a biopsy and histopathological examination.

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