Try searching for tattoos and you'll find a very long thread that address all manner of appearance issues. It will also have you rolling on the floor laughing at some of the responses.
I once saw someone wearing a diamond stud at an early stage interview and suggested he remove it next time. He did and he got the job with a rather conservative company even though the hole was visible. I also saw someone at the same event who had removed his earring, which was one of those larghe sorts you could fit a fat pencil through. The gaping hole doomed his chances of progressing further because he looked totally outclassed by everyone else there.