So basically I have been trying to get a scar on my character's shoulder but when I try to do that it looks very weird.. is there anyway to just.. directly paint it on somehow? Because this takes way too much trial and error ):
I had this issue with back tattoos because they are over a seam. You could possibly alter the UV map but Ive no clue how to do that. You could Alter the textures but thats a bit more complicated near a seam. Try this and see if it works.
Check that you a using a LIE for the right base figure as the UV mapping isn't the same between different Genesis generations, eg. between Genesis 1, 2 and 3/4. LIEs are designed to work on specific figures and male/female characters and those with different or custom UVs will cause LIE addons to not line up correctly.
If it's a female LIE on a male or vise versa you could use something like this to convert the UV mapping.