I had Mohs surgery on forehead. My eyelid is blood filled. How long should this last?

This is something that should be discussed with the physician who performed your procedure, and I'm surprised wasn't already discussed with you.  Any surgery of the forehead causes swelling and bruising around the eyes as the edema and blood flow down with gravity and pool around the eyes.  But without a photo we cannot give you a definitive diagnosis and you should seek the advice of that doctor who treated you. I wish you the best of luck, Dr. Emer.

Please discuss with your Mohs surgeon and/or plastic surgeon if one was involved in your reconstruction. Simple bruising resolve within 7-10 days but it sounds like you might have a hematoma which might require further treatment. It will definitely take several weeks to resolve regardless. I hope this information is helpful for you.Stephen Weber MD, FACSDenver Facial Plastic Surgeon

It is not uncommon to see significant post op periorbital edema and ecchymoses following forehead surgery. Regardless, I would suggest discussing with a Board Certified Dermatologist with expertise in Mohs surgery.