Hi @DaniNicooole and Fiona, welcome to EBN
Was the spot wet-ish like a hot spot in the beginning? My Bennie has had hot spots but the areas haven't been bald afterwards... so I'm unsure if was a hot spot Fiona had there the location also seems odd but I don't know... my bulldogs have always gotten them around the neck/chest or face area.
Sometimes if they for some reason lose the hair it takes very long before it grows back if it ever does. My Boeboe still has a small bald spot on her back from a skin scrape four years ago.
You could try and rub some coconut oil on the area, coconut oil is a great product to use. I feed it to my bulldogs every day
I'm gonna tag @2BullyMama she's always great with skin stuff