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In some individuals when they consume chilled beverages there is spasm of blood vessels which causes congestion in the nose and oral cavity. The pain you are perceiving behind the ear lobes is due sudden blockage of the Eustachian tube secondary to the nasal congestion
. Do steam inhalation and drink plenty of warm water after consuming chilled beverages. I doubt any sort of tumors. If you are still worried, better to consult a good ENT specialist