You look good with and without hair. The best thing to do is see if this helps with your psorsis and decide from there whether you want to keep the look.
I know other are saying get the razor out but I think you should see whether there is an improvement to your psorsis before getting your head out. I would assume clippers might be kinda to it than a razor. Plus if it clears up and you like the look and fancy going fully sly, you can do it on a friday and it'd be back to a skindhead by Monday.
Having less hair on your head might allow the condition to clear or at least potions that might treat the condition to seep in better! If it does improve you'll have the chance to decide whether you want to go sly or grow it back.
Well done on finally doing it