Can anyone tell me what this is???

Make sure you head to the doctor right away. Anytime a reaction is on the face it can lead to anaphylaxis.

Its heat rash I was told to put hydrocortisone on it

You need to head to the doctor's office!

Hi this is either a allergic reaction or heat rash. Is there any swelling to the face area? Is his breathing rapid/slower/gasping/weezing? If so dial 999 for a ambulance this can be a anaphlaxic shock and can be life threatening. If theres none of the above take him to AE to be checked imediately. It could be delayed reaction. Has this come up after eating drinking or taking a medication? Im a AE nurse and work in peads id strongly advise you to take this little one to a hospital because if its a allergic reaction it can be very serious hun

Is it warm to touch and swollen? It looks like an allergic reaction. 

Hows your son today? Hope the creams worked and cleared it up. Hope hes ok. Just thought id drop a line.a.d see how he is today

That's heat rash. When did it start? Was he in the car seat? 

It comes and goes

Looks like poison ivy

Looks like a heat rash, but I would be rushing my son to the hospital because I panic over everything. Hope he gets better soon!