How long to try treatments?

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Thanks Fred. I notice you mention coconut oil alot. Have you heard of coconut oil causing iching only when applied to the scalp? I have tried it on my sons body with no issue but everytime I try on the scalp he says it is itchy after...and like all the other treatments I am not sure how long to keep trying or when to stop. Good to note about the bio's...and if we want to be a guinea pig or not 

A lot of people find coconut oil soothing, I actually find it aggravates my P. I think if something like a moisturiser that is supposed to soothe and does the opposite, you may as well stop it. It’s different for medication from the doctor which may irritate at first and needs to be given a chance to work.
You probably don’t want to try yet another product, but I did find oilatum shampoo good.
Another thing to try is reducing the number of baths/ showers to see if that helps.