Bounce Back After Collision

I am creating a 3rd Person Platformer prototype and as of right now I have a working HUD that updates health upon collision with a hazardous object. Unfortunately, the HUD continues to update because the collision continues without faltering, so I am trying to create a minor bounce effect to push the player back after hitting a hazardous object and I was wondering if I could please have some help. I don't know where to start from.