Question: Hello :)

I have question about rash or hives on my arms
and a rash on my chest.

Sometimes few minutes after I wake up in the morning I get hives on my wrist and arm very quickly, and spread over the arm in just 1-5 minutes. Sometimes it's very itchy and sometimes it's not itchy. If I just leave it alone it takes 10-45 minutes and it's totally gone, and you cannot even see it was there.

I haven't had this before, it started for 3-4 weeks ago and have had it like 5-6 times now.
I notice maybe it's because I sweat through the night and that could be a trigger ?
and sometimes if I wash my hand with too warm water I do get it also ?
what can be the cause and do I need to worry ?
I have attached some images of the hives.
normally my skin is clean and normal and I have good hygiene.

the second question is a rash on my chest, it has never been itchy and it started of slowly and the progression was slow and turned into a few more rashes. you can see before and after images and I think it started for about 2 monts ago. It doesn't give an problems and it's not getting bigger.
I have read about Pityriasis rosea; but I can't see it anywhere else on the body.

do I have anything to worry about and is there any connection between this two ?

- I haven't changed anything in my life that I know of; the only change in my life is I had Nissen fundoplication and hital hernia surgery in january; and maybe the food has changed a little bit after that.
otherwise I feel perfect and healthy.

best regards
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