heise und geizhals sind das gleiche <| sep |> It looks a bit like tinia nigra . Im not a dermatologist , but my daughter had tinia nigra on her hand that looked like this , and it kept slowly growing over many many months . Yours is growing much faster than that , but still looks like a larger version of the same or similar fungus . I had 3 different doctors tell me it was just skin pigmentation for a year too . I searched google images and eventually found my answer . I couldn ' t believe it was a damn fungus the whole time . It cleared up within a week of recommended treatment . I kept applying for 2 weeks after it wasn ' t visible , just to be sure ! I used Whitfields ointment . Anything with benzoic acid though would have worked . Warning I am not a medical person of any sort .