
Rash That Started On Shoulder, Now It Is Spreading Over Body. Any Infection?

Thanks for posting your query.
Looking to the information that you have shared it seems that, there are chances of having some allergic reaction.
Generalized, itchy bums, progressing fast mostly favours some allergic cause. The other less possibility is of viral rash.
It can be due to any form of allergy, may be from food, cloth or anything.
It is good that you are already going to a doctor.
You can take anti allergic tablets that you have with you, in case you are uncomfortable with itching.
Taking tablets will relieve itching and provide temporary relief, at the same time if can mask the diagnosis, your doctor may not able to see the rash.
In general:
Please drink plenty of fluids
Avoid any form cosmetic on skin
Avoid some specific taste food which could be offensive, and you have known allergy to it.
I hope this helps.
Please visit your doctor as planned.
Wishing you good health.
Dr.Pragnesh

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