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The appearance of vitiligo-like lesions in patients with malignant melanoma is a well-known yet uncommon phenomenon. This finding is especially reported in patients undergoing immunotherapy with or without chemotherapy for malignant melanoma and is generally believed to be associated with a better prognosis. We report a case of preexisting vitiligo in a 48-year-old man, aggravated after chemo-immunotherapy of pulmonary metastatic melanoma with interferon-α, vinblastine and dacarbazine. Skin lesions remained stable after discontinuation of the treatment, and repigmentation heralded the recurrence of metastatic disease. These findings were in favor of vitiligo being a marker of the immunity against melanoma cells and its favorable impact on the prognosis of melanoma patients.