Yes, it is possible to have melanoma for years and not know, especially if the cancerous mole or lesion is small, not causing noticeable symptoms, or located in areas that are not easily visible. Melanoma can develop slowly over time and may not always present obvious signs or symptoms in its early stages. Some melanomas grow very slowly and remain confined to the outermost layer of skin for an extended period before becoming invasive. Regular self-examinations of the skin are crucial for detecting melanoma and other skin cancers early. Checking your skin for any changes in moles, freckles, or the appearance of new growths is essential. Pay attention to the ABCDEs of melanoma: asymmetry, border irregularity, color variation, diameter (larger than a pencil eraser), and evolution or change in size, shape, or color.