Ugh, I have itch cause by water contact and with change in temperature…I also have other symptoms that are now under control but the itch persists. The only thing that helps is a otc amino acid supplement that is typically used as a preworkout supplement, Beta Alanine. I buy the NOW brand on Amazon and take 750mg every four hours as needed…been taking for 5 plus years and it works beautifully…cost is about $20…and ma6 be worth a try…
Two Stanford Dermatologists read about this blog and tried this with a patient and it worked for him…I hope this might just be relief for your husband…
https://stanfordhealthcare.org/publications/798/798771.html