With Voldemort dead, it would be more of a scar than a tattoo if going by what JK Rowling said

The Death Eater’s Dark Marks eventually faded to look like a scar. It will no longer burn or hurt.
These are some facts that J.K.Rowling let slip in nu...

withlovenatalee: !!! you do? of what? The deathly hallows?

OMG that is amazing! and LOL@ when I searched it in google... your image was the FIRST image to pop up under the search terms "cave chapter art harry potter"