I experienced some swelling after my hair transplant, and it lasted for about 3-5 days. It was a bit uncomfortable, but I followed my surgeon's advice to keep my head elevated and apply cold packs to reduce the swelling. It eventually went down on its own, but it was definitely a relief when it finally subsided.
In terms of evidence-based remedies, following your surgeon's post-op care instructions is key. I also found that staying hydrated and avoiding salty foods helped to minimize the swelling. Don't be afraid to reach out to your surgeon if you have any concerns - they're there to support you through the recovery process.