A man in his thirties was suspected of committing a sexual offense against a young girl. A video on his mobile telephone provided the only evidence. Photographs obtained from the video showed male genitalia in two views, with the penis in both views exhibiting unique pigmentation. We appraised this case with the cooperation of dermatologists, who diagnosed the pigmentation as male genital melanosis, a relatively rare disease, which matched that on the suspected perpetrator’s penis. Photographs obtained from the video were thus decisive evidence of sexual offense and identified the perpetrator.

中文翻译：

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生殖器黑变病的视频图像提供了强有力的证据来支持识别性犯罪者

一名三十多岁的男子涉嫌对一名年轻女孩实施性侵犯。他手机上的一段视频提供了唯一的证据。从视频中获得的照片在两个视图中显示男性生殖器，两个视图中的阴茎都表现出独特的色素沉着。我们在皮肤科医生的合作下对该病例进行了评估，他们将色素沉着诊断为男性生殖器黑变病，这是一种相对罕见的疾病，与嫌疑犯罪者的阴茎相匹配。因此，从视频中获得的照片是性犯罪的决定性证据，并确定了肇事者。