I have KP too. Upper arms, thigh to a lesser extent. Gets better in summer, worse in winter. The latest development since my pregnancy is the addition of itchy scabby bumps on my scalp, mainly above the nape of my neck.
The ammonium lactate cream seemed to help a little but I never got in the routine of using it twice a day everyday as prescribed, so I thought 'maybe it would work if I used it consistently instead of 5-6 times a week or whenever I remembered to use it'. Gentle exfoliating also seemed to help a bit, but scrubbing too hard only makes it worse.
I have a large tattoo on my right arm/shoulder and have also considered covering both upper arms to camoflage the red bumpy chicken skin. So far that seems a bit drastic and too expensive.
Now I am very interested in eliminating foods that might aggravate it. As a young teen I had a positive skin test for allergy to wheat and corn, but my symptoms have been too mild to warrant a complete diet overhaul. I did try baking oat and rice flour breads for a while, but eventually decided to live with the bumpy skin and dark undereye circles. FWIW, my genetic heritage is Celtic.
Has anyone had seen an improvement in KP after eliminating wheat and/or corn? What about dairy? I don't know much about gluten sensitivity, is KP a symptom? I *think* I have seen an improvement since adding fish oil to my diet, the redness has diminished and the bumps are smoother. I would love for them to disappear, is this at all realistic?