My husband used Eucerin body wash in the shower, took cool showers, used Eucerin moisturizer after the shower, took Hydroxyzine (Atarax), used
Triamcinolone (a topical steroid ointment), and we put tea tree oil when he got a few small blisters on his back.
You need to check the Incivek website. There are pictures of a "mild rash", a "moderate rash", and a "severe rash".