Thank you very much for the useful information Anwaar.
Most likely yes, this is chicken pox as stated by 2 of the doctors.
This usually takes a week or two to settle down completely (new lesions will not appear after that).
For itching you can give him benadryl syrup (available over the counter).
Also you can apply calamine lotion over the body which provides a soothing effect from itching and irritation.
Continue with rest of the treatment, hopefully this is going to settle down soon.
Honestly these kind of viral infection do take some time to settle and the medications given are usually for symptomatic relief and to prevent any serious complications.
Reassure your friend, and tell her that by end of next week things would be much better.
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