Absolutely nothing to do with tattooing what so ever.
Sorry, I just get a bit flustered when different body modification techniques are grouped together when they are not similar in any way.
Sure they can and will both be done because they look pretty but yeah.
I have seen many scarifications where people have self harm scars that are too prominent or there is too much scar tissue for a tattoo to work and I, personally, think that they can turn something not so nice into something beautiful - I know that when, if ever, I do fully recover, then I will be seriously considering this as an option. - I also think that as this is something completely natural, no ink or anything being added, then it can be a way to add something to the body and what not.