Most of ours have had quite a bit of drainage. To keep them from scalding between/down the hind legs and "butt cheeks", we liberally apply vaseline. I make my own "Swat" from vaseline and use that on the haired portions of their bodies as well. Then we braid tails. Every couple of days, the vaseline would be washed off with Dawn soap, then re-applied - especially on the colts that would find a sand wallow in our pastures (GAK, gross).
The cold hosing and exercising seems to be something that is done by state or location. All of the vets I've worked with have recommended NO stalls (even in the 70s/80s in CO), preferably out with a group that they are used to to help move them about, cold hosing and exercising at least once daily (even for weanlings) and one vet insisted on 2x daily. When I was working with that particular vet part time, I remember (& have in my notes) 10 cases over a 3 yr period of horses (1 mini/pony, the rest "biggies") of different ages that were kept up in stalls, on anti-biotics and still got serious infections...
I have found that the Shetlands/Minis seem to do better than the big horses - less swelling and drainage overall (than our biggies). But if they got any swelling they acted worse about whatever method (s) you used to combat it, LOL.
Personally, I use gelding as a time to get a lot of extra handling in on ponies that might not get it otherwise. They learn to lead with voice commands, lounge (the younger they are, the less time/speed they do), ground driving, harnessing and even saddling (though most of mine have been gelded long before we'd start riding them). This works especially well for me now when I have so many ponies and I'm by myself (all 3 of the girls are "gone" now) and I just don't have time to handle/groom/train each one every day anymore like I did even 4 years ago.