Thank you for your medical query at AskTheDoctor.com
I understand your concern.
I think you meant chicken pox, as small pox has been eradicated.
There is no such topical medicine apart from Calamine which helps in reducing the inflammation and the irritation.
If required you can take an antihistaminic like Levocetirizine orally 5 mg once at bedtime till the itching subsides.
Hope this was helpful,
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