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 Covering scars would certainly be a way for them to serve a purpose, but it also seems like tattoos themselves are a kind of self harm, tho maybe to a lesser degree. 
 haha i can see that. i had a roommate that would get a tattoo or pierce herself when going through it. 
however, i’ve also met people that use tattoos as a love letter to themselves, or to symbolize the love they feel for others (my dad has the name of each of his kids tattooed). i think they can be nice investments after they’ve been planned and saved up for.