Yeah, the only thing plants will recover from is yellowing. If ever yellow turns to brown/copper/grey that tissue is dead, and will never recover. Unless the leaf is more than 50% damaged (dead) don't remove it, it will/can still capture light and store food for the plant, just not as efficient as the un-flawed leaves.
Also dude, you need to be telling us were on the plant this pictured leaf came from (top...bottom) that gonna help us a lot. Only thing better is a "whole plant" pic, with addittional close ups of the problem leaves/stems/roots