As the thread that was debunking lots of information regarding several conditions has now been deleted. Here's a place to get the good info on CPL, PPID, etc.
Cobs shouldn't have lumpy, sore legs. It's not normal for any horse. Talk to your vet about the possibility of CPL, as the sooner you start to manage it, the better for your horse. Prascend works well for treating PPID. Try it and see.
Hindgut ulcers do happen. They have been observed post-mortem.
It is not “normal” for ANY horse to have skin folds, oedema, thickening of the skin, sores or hyper keratosis on their legs.
There are loads of things you can put in place to manage this & keep the horse as comfortable as possible but most of them do involve keeping the legs clipped. (& the sooner / earlier on you put all this in place the slower any progression will be)
Jill Scott / The Clipper Queen has an EXTENSIVE library of information on CPL (plus her clipping videos are ) and there’s an excellent CPL awareness page on FB as well or here https://chronicprogressivelymphoedema.com/
Prascend is the only thing that can slow the progression of PPID.
Remember it's a type of brain tumor: Agnus castus or anything else will not stop it growing, they might mask the symptoms but that is all they are doing.
Do all horses take well to prascend, no, not at all, but it can also hugely improve their quality of life, if introduced slowly.
PPID is also a real actual disease with a wide range of symptoms that requires careful management and treatment. (And it’s not just a disease of “old” horses either) Prascend can be absolutely transformative for horses it works well for and is a recognised treatment to slow progression of the disease.
Lots of useful, good quality information written by vastly experienced and qualified people below
Finally got to the bottom of the Friesian’s scabby legs - photosensitivity and yes they are black legs so it is possible. Bought him some UV boots and almost all of the scabs have gone and stayed away!