It is not uncommon to experience changing sensations as tissues heal, but increasing pain three months post-parotidectomy should be evaluated by your cousin's surgeon. Possible causes include nerve regeneration as sensory fibers recover, scar tissue tightening, a delayed localised infection, or minor fluid buildup. For relief, their doctor may suggest simple pain relievers like acetaminophen or ibuprofen. If the pain is nerve-related, medications like gabapentin can be very effective. Warm compresses and gentle scar massage may also help. Please reassure your cousin and encourage them to contact their surgical team for a quick evaluation to ensure proper healing.