Marks of Possession

Recently I was in a position in which I was not able to wear my collar due to certain circumstances. During that period my Master placed temporary marks on my skin. Some of them were done in simple sharpie, some were dine by light carving.

All this has left me wondering about permanent markings upon my body that cannot be removed. Tattoos, branding and scaring. What kind of significance does that lay on the heart of a slave?

Does it show? Is it hidden? What does it say/picture? Does the slave have a say?