We should all just accept nothing works if you ask me.
Apologies for long post, but 'nothing works' is a counsel of despair, which we don't need.Dithranol
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, but only if you can get it in sufficient concentration, and in a suitable base, and in a suitable environment.
I was cleared completely of P, during 2 weeks' intensive in-patient hospital treatment in a dermatology ward, in 2005. Many other patients , whom I saw come and go, were also cleared. Some were 'regulars', who'd been several times before. (See the BBC TV series "The Singing Detective", starring Michael Gambon)
I had it badly on my scalp, and in patches all over my limbs & trunk. It's an extract from an Asian tree. The problem is that it's terribly staining. It turns everything it touches bright red/purple, resulting in vast daily piles of horribly stained laundry. All the hospital linen was a deep maroon colour, so it didn't show too badly.
The regime was to start on 2% dithranol concentration in a paste, achieve clearance, and then very gradually wind down through progressively more dilute pastes, to 0.1%.
When I relapsed a few years later, I explored the possibility of following the same regime at home, but the strongest stuff I could get was just the two lowest concentrations, and of cream not paste. I tried it for a while, with, as I'd expected, no effect.
In general, over all the medications, it seems to me that the ointments and pastes are obviously preferable to the creams, if you can put up with the mess. Your skin is basically greasy, and greasy things will soak in much better than watery ones.
I'm now keeping things more or less under control with Dovobet ointment (cautiously, every few days) on most of me, and "Xamiol" (runny Dovobet) on my scalp, after clearing the mess first with "Sebco" a salycilic acid concotion, analogous to the hospital concoction 'Scalp', and to 'Cocois'.
So if, you're desperate, and can organise hospital treatment; there are possibilites; but they'll be difficult to find in these straitened times.