another good food suppliment is either hemp oil or seed oil, both can be found on Zooplus, we use the Velcote nut and seed oil for my dogs exzma and it does help a lot.

slightly warming a little almond oil (from aromatherapists) and applying a light coating may help.

Also applying Manuka Honey to his skin may help as even if he licks it off it has healing properties... very sticky though

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