rash almost appears to be bruising? appeared last night
Looks like urticaria, take antihistaminic
Welcome to ask a doctor service
I have gone through your query and reviewed the attached photographs.
It seems to be urticaria which is an allergic reaction.
I would recommend you to take antihistaminic like tablet cetrizine 10 mg once daily for few days.
This should resolve it.
I hope to have answered your query and would be happy to answer any further queries.