Hot water irritates dh so shower or bathe with the coolest water you can stand.
Witch hazel helps to cool off dh especially after the shower or bath.
Ice packs on dh.
Vanicream is gluten-free & moisturizes, especially when the crusts/scabs are rampant. If you put Vanicream in the fridge it really helps cool when it goes on. Cromolyn cream is a combo of Vanicream & Nasalcrom which helps with the itch, sting, burn, pain of dh. Recipe is here:
Walgreens pain relieving ointment works great; contains 20% benzocaine. Orajel also contains same ingredient.
CVS Calamine Plus itch relief (pink).
Benadryl Extra Strength Itch Stopping Gel.
If you have spots that are isolated from others enough; you can put vaseline or neosporin on the spot & cover tightly with a band aid. It will itch, sting or burn intermittently for a day or two & then stop as long as you keep the band aid on it.
Sun seems to irritate dh so avoid getting sun on those areas.
Sweat or getting overheated makes the dh rage so try not to get it fired up.