I just happened to be looking on line in regards to a skin irritation my child has, and found the answer to my husband's skin problem!
Since childhood he has suffered from excessively dry skin patches on his body but primarily on his legs. The skin flakes terribly and is stuck on with brown patches that often bleed if he scratches at them. He also experiences flashes of internal heat when his skin wont breathe during the spring and fall. His scalp gets very flaky during the winter and he can scrape tons of skin off of it in the shower.
As a child his parents took him to the doctor and they called it dry skin and told him to moisturize. We have been to the dermatologist since, but nothing was said of ichthyosis. they called it exzema. (sp?)
He does not sweat except across his chest area in extreme heat, so as a child he was told that was due to faulty sweat glands! All of these characteristics, however, seem fit what you are discussing here!
The fish like scales caused him to be ridiculed as a child, but he has learned to live with it since. One thing that has always brought him tons of relief is swimming--especially in the ocean. Thank you for getting this info out there to people!