Hi
While driving home in the rain I stepped on the gas a bit hard and I noticed the ESC light flickered a few times then went off when I took my foot off the gas. So I need to worry about this?

 

The vehicle's computer picked up a signal that a wheel was losing traction and responded as it should.
If the malfunction corrects itself fast enough the light will go out. Other times it will take a few drive cycles to notice the situation no longer exists and the light will eventually go out.