Hives in the spring/summer

Hey guys, I’m not diagnosed but ever since having Covid I’ve had hives appear on my face every spring/summer and they go in the winter. But when I get hot in the winter they do appear then too. They go without a couple of hours and can appear within a few. They do seem to be heavily heat activated and environmental. An ice pack face mask seems to help. Not too sure what to do about it and what tests I should ask for as my doctors aren’t concerned. But it bothers me as it looks like I have acne and then my skins clear again in a few hours. Could this be a sign of MCAS? Antihistamines don’t help.