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I am sorry to hear, would you be able to provide a photo demonstrating these?
Thank you. If this is persistent I would suspect it could be a form of psoriasis.
Given what you have used you would have expected some response. Steroids will suppress it but the chronic nature is what makes me suspect psoriasis is a possible cause.
I would suggest that it is appropriate to have a skin biopsy of this at this point to confirm a diagnosis.
You would need to either go to a local private dermatologist or request your Gp refers you.