Four Horsemen and Cuts/Swelling, Something Odd...

[Double_L]

Lately I've been going back and watching Leonard, Duran, Hagler, and Hearns and all their fights between each other, and I noticed something weird. There is a noticable lack of cuts and swelling in the fights, with the exception of Hagler-Hearns.

Does anyone else find this strange, considering almost all the fights were vicious wars? Is it just a coincidence? Do all the guys have blessed genes?