1. Regret - your tattoo seemed like a good idea.
2. Poor tattoo quality.
3. Friends were getting them.
4. Your tattoo contains the name of a former significant other.
5. Your tattoo doesn't fit your personality anymore.
6. Your tattoo is visible, and can't be covered with clothing
7. Some employers or professions don't prefer tattoo's to be visible, which is hindering your career or ability to get hired.
8. You would like your tattoo faded for a different tattoo in the same area. Some tattoos are difficult to effectively cover up.