Do you think Snape had a tattoo besides the darkmark?

I don't know. I guess maybe if he did it was a Lily heart. But Snape doesn't seem like the kind to get a tattoo to me.

Yes, he had a butterfly tatoo on his back. xD

Canon Snape, no.

Fanon Snape, I suppose whatever the author of the fic can imagine, if they choose.

Yes, he'd have magical runes tattooed on his back

Don't think so. He don't seemed to be proud of this way to brand someone, after all he has lost Lily since he became a death eater.