You have seen a dermatologist and that is good. Yet, if scabies treatment doesn't give relief go see a different derm to get another opinion. I made a mistake initially not understanding how complicated skin diseases were and how difficult diagnosis is to diagnose. I have seen over a half dozen derms in the 15 years I have had eczema and often learn something new from each one .Always get a second opinion and trust me your pcp is not specialized enough to help you figure this out. Even derms have had a hard time because of all the skin diseases. Initially I didn't know enough to even ask my derm what type of eczema I had and she never offered to explain the differences. The differences are important as each form has many unique triggers and special treatments. Also it is not clear to me what they called your rash initially. Have your docs ever called it eczema? What drugs have they prescribed, steroids? Yet steroids don't work on certain forms of eczema and have long term side effects.

The internet is an indispensable tool. A New Zealand dermatology site, dermnetnz.org is the best I have found to help you diagnosis what form of eczema you have. Simple easy to understand definitions of each type of eczema symptoms and triggers. You may learn your symptoms are not similar to any form of eczema, but they also cover other skin diseases. The photos are most helpful, showing the visible symptoms of the rash. Many eczema rashes are specific in shape and appearance and locations. I have used this to self diagnosis a new and rarer form of eczema I developed and my doctor kept treating like my other 2 forms and treatments weren't helping. Also check out other skin diseases for photos, most rashes for a specific disease have a unique look.

I am sure you have checked about skin diseases caused by your liver meds or treatments.

I now have 3 forms of eczema and yes I also have an auto immune disease which is common for eczema suffers. My most severe form is called Allergic Contact Dermatitis, ACD. Eczema and dermatitis are use interchangeably. I developed this at age 55 just after I developed an auto immune disease. Your rash location makes me think of what you may be contacting. With ACD my worst allergies are to an element in rubber used to make memory foam, MBT. My pillow and mattress of 6 months was made of memory foam. Also my scalp was fiercely itching. I was allergic to the preservatives MI/MCI used in most all my grooming products. I now use Grandma's Bar Soap for face and body as a shampoo and for all hand and body washing. I have been using it exclusively for 2 years because of the simple ingredients. Only 2, lye and lard. The lye is converted into glycerin in the soap making process so only lye and glycerin contact you. Just recently it got approved by Mayo as a SkinSafe product. Works best with soft water as a shampoo, but if you don't have it just wash an additional time. It will lather nicely and leaves hair shinny an skin is not dried out. Amazon.

Because of my research and being proactive I have helped my doctors and the doctors have helped me and all 3 forms of my eczema are in remission.