Cock ring

Okay, so we went and got toys and i wanted him to get something for himself and there was cock rings and they all looked like the same size and he got a pretty exspenrive one thinking it would be good and when we got home and get freaky lol that thing was literally turning his penis blue. It was so damn tight. His whole dick was massive in that thing. He’s average I wouldn’t say he has a huge Dick but it’s a good size? I’m not sure if this is even healthy to have if it’s gonna make it blue. Thoughts? Also this is his first time isnt one.