Especially in the MCU, the markings on Drax' body are quite extensive (and very cool-looking I might add). They have a heavy leather-like texture.
From what I could find, Drax's body is alien and apparently for now, it has not been disclosed what kind of alien that would be.
I have read some, but not all, of the canon Guardians of the Galaxy comics, where his markings are more subtle, and more tattoo-looking.
Is there any more information known about his markings in any source or canon ?
I am specifically referring to his later incarnations, as his first appearances do not seem to feature this kind of body decoration.