enemy attack the player

I have creature and player when player reach creation place creature should come near to the player. My need is if player comes in contact with the creature player body outer line should blink in green color.if player successfully avoid the creature with out collision the creature body outer line should blink in green color.How to detect the collision between the player and the creature.if player comes in contact with creature five times he will lost 1 point how to detect five collision between player and the creature and if player successfully avoid the 3 creature how increase the player score.