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Good morning, I am Dr Ruff. Thank you for contacting us today.
I am sorry that your son is having this. This sounds like it could be seborrheic dermatitis or even psoriasis. The treatments you have tried are used to remove excess skin as over inflammation of the skin causes this. If this has not helped, then a topical steroid may now be more appropriate. A steroid scalp solution is available for the hair, and a topical steroid cream would be better for the nose.
These do however require a prescription.