I did a search on dogpile.com (select images first) for DH and it shows all kinds of pics of DH. Apparently there are many forms of DH. There is also a DH online website that may be useful to you:
http://www.dermatiti...g.uk/links.html I know that there are prescription meds for DH but I don't know any of there names. I try and control my sons through diet (no dairy, eggs, gluten), he takes borage oil, digestive enzymes, acidophilus, he only wears 100% cotton (even his bed sheets are 100% cotton). I've read that dust, dust mites, pet dander can contribute to the itchiness. So, we use one of those pleated allergen air filters at home. Currently we use dove sensitive skin at bath time but I am in the process of trying to learn how to make soap rich in hempseed oil and shea butter. Also, against some doctor's opinions, after bath before bed, I slather him down with Vaseline. All of the above have helped my son. Perhaps they may help you.
Also, I recently read, but have not verified, that people w/DH should be careful of the amount of iodine in their diet. I'm not sure about that, like I said I haven't had a chance to investigate it further.
Good luck. If I think of anything else I will let you know.