When ever my body changes temperature my skin gets itchy?

When ever i walk out of a cold environment into a warm environment i get itchy skin, example, today i was drinking a coffee and when i had finished it my body was warm and my skin started itching realy bad, it felt like hundreds of spider's where biting my skin. but it does not happen when i leave a warm environment into a cold environment. would anyone know why this is happening? i am a 15 year old male and when it happens it last's about 5 minutes. any answer's will be mega helpfull, thanks :)