question: Hi my three year old has a rash. I noticed it this morning on the inside of her thigh and it spread while we were at the zoo.  It isn't blistered or raised...just red and splotchy.  The patches are very big and initially it looks like sunburn until you look closely and see that its actually small dots together.  you really notice the pepppering of small dots going down her calfs.  The rash is hot to touch where ever there is a large red patch.  She says it itches.  She played in her sandbox for the first time yesterday.  The rash seems to be everywhere the sand would have touched however last night at bath she didn't have it yet.  It developed over night I guess.  She has a skinned knee but there doesn't seem to be an infection near the wound.  She doesn't have a fever.  What is this?  Why is it hot?  Over the phone my ped. said to give benadryl and use cortizone and that it was likely contact dermatitis.  I didn't notice the heat coming off the rash until tonight after bathtime when their office was closed.