Disaster waiting to happen?

Hi guys i bought this macbook of ebay last week everything seems fine but i spotted a little mark on the corner of the case and it got me worried after i read about the chips that are very common on these models..
ive attached a photo for u guys to look at and tell me if its something i should worry about? or it might have been just hit with an object to give that illusion by mistake..?
thanks

 

thanks for the quick reply. do you think it is just a minor mark ? i really dont want it to chip off..thanks

 

excuse me ?