This app was mentioned in 5 comments, with an average of 1.40 upvotes
I've used Point Blur on Android before, you can blur the tattoos. I would think that would cover it up enough. If looking for iOS I'm not sure.
https://play.google.com/store/apps/details?id=jp.co.pointblur.android.app.quick
Using it for close to 1 year now. Absolutely Recommended!
I use Point Blur
Never used it, but Point Blur doesn't have many permissions