My toenails are one of my major signs. My little toenails are currently discoloured and crumbling. I have at least five splinter haemorrhages right now. Longitudinal grooving. A couple of "oil spot" signs. Mild onycholysis (my nails are lifting off of the beds). And crazy wavy white lines that I believe are hyperactive keratin build up? Every single one of my toenails is affected in some way.

That said, my fingernails are mostly unaffected!

My toenails also were largely affected. Some more than others largely my big toe and the toe right next to it have like a fungus on the nails. I'm just thankful the others don't maybe they're smaller and enough of a space between the toes I'm not sure. I have gotten prescribed toenail treatment which has largely improved them but the doctor said at the foot Care clinic it is only about 60 something percent effective. It means it may return. The treatment is something you put on the nail not orally taken. He said the oral would affect possibly your liver so you want to avoid that. It is needed to be used topically for about 6 months which is a long time with no guarantee of it staying away. But on the flip side this is extremely decreased the condition of what it was. I am applying those to the toes and it says you put it on for 6 days and leave it off for one and having to use nail polish remover to completely take it off after the 6th day to start over again. Whatever works I feel as needed at this point. I don't want to speak too soon and I'm thankful my fingernails are fine in appearance. If I look closely I'll see lines through them but nothing discolored and nothing deeply grooved. I've learned you got to look at the blessing and not the burden. I'll take the blessing I can get. Whatever way is showing on.
For my feet themselves they flared up, I've never seen it like this before but the soles of my feet get red and inflamed. I have dovonex cream which is a synthetic form of vitamin D. I apply it twice a day, that really seems to have helped but took a while to take effect. I also got vtama cream prescribed from the dermatologist and that is feeling good when I put it on but it's once a day and absorbs fast. So I'm not really sure if that's effective any. I hope this information helps whoever is having feet issues with PSA.
Both the topicals I take are nonsteroidal. The topical nail treatment is clear and a little bottle lasts a long time. You only put it on the nail affected. That doesn't seem to be a steroid too. I would have to check the name of it. To be sure of what that is.

I only have a "provisional diagnosis" right now for PsA. Complex story, but it looks like I was misdiagnosed a year and a half ago. Going back to rheumatology shortly. Will likely try DMARDs as that's first-line treatment where I live. Best of luck to you.

Thanks for the reply, Marc. Is there any treatment for any of your symptoms?