I have to question the mentality of people who choose to have a permanent and totally un-natural blemish put onto their body. It is a form of self harm in that it is a form of self dis-figuration..
Being a teacher requires a stable mentality and having highly visible tattoos suggests the person may not have a mentality best suited to teaching.
A small discretely placed mark such as a loved one's name or similar is in my opinion perfectly OK but a "work of art" in full view. No way......