At age of 6 I accidentally dipped my hand into a boiling indian curry(Sambar) which was in a large pot. I got a Boiling Water Burn(Just like in the picture but with a little more radius) in my hand right away and my grandma applied some toothpaste on the area. It has been 11 years now and I still have that mark in my hand.
The question is why is the mark in the center(In circle form) of my hand and not spread down the whole hand which was completely submerged a little above the mark. The curry's temperature was pretty uniform around the whole mixture.