Looks like Sword of the Uninvited 94 1H slasher weapon got small uninvited white dots on it :/
Actually, if you look carefully, they are visible ingame, when youre inspecting someone. Someone noticed it and told in civil, but apparently didnt reported it as a bug.
I dont think its an intentional aestetical detail of the weapon, but a small artist's miss, which can be easely fixed.