How long to try treatments?

[D Foster]

I use Polytar shampoo and it's not very aggressive on the scalp it may be the answer and worth a try. I would certainly ask about Cocois it contains coal tar, salicylic acid and precipitated sulphur. Coal tar is mildly antiseptic and relieves itching. It also acts as a keratolytic which works to break down a protein which forms part of the skin structure called keratin. Skin cells are thickened due to the deposition of keratin. Coal tar therefore helps to reduce the excessive hardening, thickening and scaling of the skin.
Salicylic acid and sulphur also act as a keratolytics, which result in the shedding of skin cells from the affected area. Sulphur also has a mild antiseptic and antifungal action.
I used to put it on at night then cover it overnight with a shower cap then use the Polytar in the shower next morning but use to comb the hair before I washed it off to loosen any flakes.
I would have a word with the dermatologist before using it but it does work very well if a bit messy.