Do you need a licence to carry out ear piercing on others?

Actually, there are alot of pros that aren't certified. Piercers get certified with the APP. To get the certification they have to go through a series of steps and pay fees. Generally, all APP are really good but, if you know someone whos been piercing for a long time and has a good track record and isn't APP certified, it would be fine to go to them. Some people just don't want to pay what it costs to keep up a membership.