Take kachha doodh(Fresh milk) ,add chiraunji(charoli,which should be soaked in water)and mix it well.Make a paste of this mixture.Apply it on chicken pox marks .With in few days chicken pox marks will get vanished.
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My cousin has some marks left from an old chicken pox that she had as a child. Do you think this tip would still be helpful to her.
Yes if they are quite old then the will lighten up and if she is in her adolescence age then they will completely disappear.