
Suggest Treatment For Itchy Rashes On Feet And Hands Spreading Throughout Body

likely to be acute urticaria.
Detailed Answer:
Hello
Welcome to health care magic,
I would keep a possibility of acute urticaria first after going through attached image.
It presents as skin welts/swellings which can be seen commonly on hands and legs but it can also be distributed all over the body.
Itching is subjective in individuals which could be mild to severe.
Urticaria or allergic hives can occur due to various causes like,
1) Infections (bacterial, viral, fungal)
2) Certain drugs(Pain killers/ antibiotics etc)
3) Certain foods and food additives/preservatives
Or It might be physical urticaria occurred as a result of physical touch,pressure, heat,cold,anxiety, exertion etc.
In a few cases, no underlying cause is found and are known as idiopathic urticaria.
You can continue with oral antihistamine like benadryl (which you are taking already) or tablet levocetrizine 10 mg twice daily for 2 or 3 days.
A topical soothing lotion like calamine would also be helpful symptomatically.
I would expect that you will start improving in 2 or 3 days and in case not,then it would be advisable to see some nearby doctor who may order routine blood counts with ESR after careful inspection this rashes and can prescribe you appropriate treatment according to the underlying cause.
But no need to worry as it generally disappears in a few days with just symptomatic treatment.
Hope this will help you.
Regards,
Dr.Sandip Kabra

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