At about 4pm on Saturday two men were involved in what police say was an altercation outside Jay Jay Salon on Soundwell Road.
A 50-year-old man suffered serious injuries to his face which required 50 stitches.
A 24-year-old man has been arrested on suspicion of GBH with intent and has been released on bail until 4th May.
The area was busy at the time so police are appealing for anyone who witnessed any part of the incident to come forward.
Call Det Con Mark Phythian at North East Investigations via 101 and quote reference 5216070046.