hole in head contagious?

[mytank90]

hello on friday night i found a someone selling there fish realy cheap on craigslist .when i stoped bye they had 6 or 7 fairly big fish in a 33 gallon tank and most fish i could see had hole in head or lateral line .there was 1 fish i realy like that was hiding in tank so i bought it .before i put him into tank do i need worry about hole in head being trasferd into my tank ?right now the angle is eating everthing i put into his hospital tank