My scalp has hardly itched at all lately, & there's no sign of redness or the other familiar signs of psoriasis (luckily both mild & absent from the rest of me), but it very recently started smelling a bit rank, however much I washed it. Obviously, not something one wants. So I dug out the long-unused anti-psoriasis shampoo, & used it two days in a row.
Smell's gone. It's another bloody symptom. Damn! I'd rather have the itching. Looks as if I'll have to start using the shampoo regularly for the first time in about three years, at least until spring. Getting out in the sun usually effects a seasonal cure.
PS. Just realised I still have the topical steroid liquid I was prescribed when it got painful. It had an almost miraculous effect. My lack of need of regular use of the shampoo dates back to then. I wonder if it's still usable? I hope so.