Our expert says:
Your husband's post-nansal drip may well be caused by an allergy, but there are many possible triggers and you are correct that the best course of action is to consult your doctor about an allergy skin-prick test, which is similar to what you describe - tiny amounts of allergen are inserted under the skin to see if there is a reaction.
Air pollution may be a contributing factor. I don't know if emissions of sulphur compounds have ever been linked to postnasal drip per se, but they have been linked to other respiratory tract problems - as well as other symptoms like headache.
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