white mark in the back of cpu ?

[Yash_rc]

soo im buying a used cpu but it has some white marks on it as show in the picture is it anything bad ???

https://gyazo.com/a33a8cadb9152d56ea0a2df747acffde

 

[Snipergod87]

Try to rub it off with proportional alcohol, might just be left over thermal paste that make it to the rear side.