Hi. Thanks for posting your concern at HCM
I would keep a possibility of Cholinergic
Urticaria.
Urticaria OR hives can occur due to various causes like(to name a few):
-Infections(bacterial , viral, fungal)
-Drugs
-Certain foods and food additives/preservatives
-Physical Urticaria: Cold temperature, Heat, Pressure(Prolonged Standing, Sitting), Dermaographism etc.
-Cholinergic Urticaria: in response to strong emotions, exercise, hot shower, intake of spicy foods etc
-
Autoimmune disorders like SLE, RA etc.
-A few cases have no underlying cause and are known as idiopathic urticaria.
I would advice you to get few basic lab tests like Hemogram, stool for ova/cyst, Urine routine, Chest Xray.
An oral antihistamine like
Fexofenadine OR
Loratadine once or twice daily for a week would be suitable. They are non-sedating and wont affect your alertness level.
A topical soothing lotion like
calamine would help you symptomatically.
take care
regards