I'm not a specialist, however this looks very similar to what I have, Atopic Dermatitis (ezcema). I have had it constantly for years, sometimes it's so bad I struggle to style hair. For extremely bad days, I use nitrite powder free gloves, so I don't come into contact with allergens.
I highly suspect mines is linked to my dairy allergy and I am becoming more and more sensitive, as the years go by.
Now when dairy is totally cut out from my diet, my hand eczema goes pretty much overnight! (It can take several weeks for it to clear from my system with no allergen contact whatsoever). However it is very difficult to avoid dairy, as restaurants and even family/friends do not fully understand how food allergies work.
Maybe get your consultant to refer you over to a skin specialist? Hard I know, as I cant seem to get under one for how many years now!
What helped me narrow done the cause, was a detailed diary of my diet, stress and every day goings on. It took years for this to be pin pointed. However I am managing my long term condition alot easier than before.
I hope you get to the bottom of it. Xx