My 4-year-olds hands are turning red and hot -- HELP!

My four year old complained that her wrist was hurting. I looked and it was a little red like she had been squeezing it. Within a few minutes I started noticing that the entire backsides of her hands were becoming red. Now, an hour later they are still quite red and I can see distinct lines from where her sleeves ended on her arm. It looks very much like a sun burn – which, in three feet of snow and snowing all day isn’t even possible. I can also feel heat coming off of them like a burn though I can’t think of anything that she could have come into contact with to burn her. Also, that she would be able to tell me. Anyone have any idea what this could be? My 4 year old is not able to tell me what she did.