Plonker!
When I did a similar thing upon picking up a metal handled frying pan from the oven with no oven glove (I am following the ways of al and am also an idiot) I found the best thing to sooth it was Sudocreme. Amazing stuff, made it better quicker than mummy's kisses.
I now have an aloe vera plant in the kitchen and several more dotted round the house, they are also brilliant for idiot moments, break off a leaf, spread sappy goo from inside the leaf all over affected area and feel the pain ebb away...