Now you've got me worried.
I felt confident about my 'Mozart' answer and a bit of Googling seemed to confirm it. So I Googled the following line to see if anyone agreed with Chopin:
chopin "cut the skin"
There were no posts found that suggested that the answer should be Chopin. However, Google did find this forum, where it's stated that
Liszt might be the answer to your question:
http://vnboards.ign.com/galahad/b20663/1081998 78/p3/
While Mozart played the piano, Liszt is probably thought of as more of a virtuoso performer (as well, of course, as a composer), so perhaps he fits the bill better than Mozart?
Chris