Welcome to healthcare magic
You seem to be having a condition called as chronic urticaria
In about 90% of the cases, it is not possible to find out a cause for the urticaria, which is when we call it is “idiopathic”.
In only about 10% of the cases, it could be due to a specific food, medications and infections, or auto-immune.
Are you taking any kind of over the counter medications especially pain killers or dietary supplements, herbal remedies, etc? If so, try to see if it correlates with onset of rashes?
Do you have a bad tooth (caries) which troubles you on and off which you seem to ignore? If so, please get it treated as many times, the source of infection triggering the rashes could be a tooth infection
I would also suggest you to get your thyroid
profile checked as urticaria could co- exist with a thyroid abnormality. And sometimes, correcting the thyroid status would control the rashes to some extent.
Have you noticed that the rashes triggered by cold
air (eg AC), sweat (eg, after a workout) or water (eg, after a shower). These are well known triggering factors.
But unfortunately, most of our patients fit into the idiopathic category.
You could take an antihistamine every day after consulting with your doctor.
Avoid foods containing preservatives ( eg , canned food, colas , etc) and those containing food colourants( eg, kebabs at restaurants which have orange colour) as they are potent allergens.
Hope this helped