Draco Scar!Canon - Specific to @doubleohdraco

Sectumsempra 

Draco has scars all over his chest and back from being hit with the Sectumsempra curse in his sixth year.  He has one scar that runs diagonally from his chin to his ear from the same curse, but that scar was the one that Snape focused on healing the most.  Though its path is clear in my incredibly rough photoshop portrayal of where it actually is (location inspired by this amazing (but somewhat graphic) piece of fanart bc holy shit), it’s super faint and only just barely raised from his skin, so likely not noticeable from far away.  Definitely noticeable by anybody who spends a decent amount of time gazing into his eyes or making out with him though, just saying.

Dark Mark

Draco has a slightly faded Dark Mark on his left forearm.

Unbreakable Vow

Draco has scars on his hand from the unbreakable vow spell used to bond the vow he made with Greg Goyle.  

Various Other Scars

Draco has quite a few other scars, including the following:

A slightly raised, swirly accent by his hipbone carved into him by Pansy Parkinson with the enchanted quill he stole from Dolores Umbridge during his time on the Inquisitorial Squad in fifth year.  While it appears to simply be a design, it’s a mixture of their initials drawn in such a way that the circles in the “d” and “p” create the loops in the infinity symbol.  In actuality it’s smaller than a dime and raised slightly off of his skin, but the same color as his skin tone, we’re just not that skilled in photoshop.  

Two large, raised, dark scars received from his Aunt Bellatrix’s cursed dagger when he was being punished for not killing muggle children fast enough during their private ‘training’ sessions.