Is it a common ? Ussually specimens from the genus Gliptopericthys and Liposarcus are very hardy...scars and battle marks are nothing much to worry about unless its very deep it and that its festering. Some medication will help but remember not to add salt...

If u have s fancy pleco...then u better pay more attention to them...

Generally as long as the water is clean with regular water changes...u wont see much poblem...