Time to time when i get out of the shower my face has red blotchy itchy spots and feels hot. goes away after about 30 mins. what is this?

Hives: You are likely experiencing urticaria - or hives. Sometimes, people will get hives due to an allergy, but sometimes it is due to something more physical - hot or cold water, pressure, vibration, stress, etc. They classically come and nothing *needs* to happen, but you could try taking a loratadine or other anti-histamine 30" prior to showering to see if that helps reduce symptoms. Good luck!