Temporary rashes mark on upper body

Patient

Q: I have donated blood yesterday in morning ( around 9:30 AM ). In evening around 6 PM rashes started appearing on my body mainly on upper body. They are appearing and disappearing whenever I am taking Avil ( tablet ).

Can anyone suggest, what should I do ?
EDIT:
Please see

Symptoms:  Rashes on upper body like mosquitoes bite. Appearing and disappearing.
Doctor

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