Rash anyone? Type 1 diabetic with a sensor and insulin pump too!

Has anyone experienced a detox rash? 2 months before my sleeve surgery, I met with the dietician. The next day I changed my diet to get used to it, get off caffeine and go through those headaches, I am type 1 diabetic so no sugar wasn't an issue, and just get things going with weight loss. About a week later, I started with a rash on my arms, hips, chest, and legs. I scratch until it bleeds at night so took Benadryl to sleep and stop itching. The more I read, the more I think it's a liver detox rash. The toxins have to come out somehow. I've lost almost 50 pounds since surgery 2 months ago! As my diet progresses, I make sure to eat one serving of starch or carb a day. Small mini taco flour shells, or a few canned veggies. I use Aveno in the shower, plus lotion galore. Skin seems so dry and bumpy even bough I drink a TON of water. Sometimes more than 64 oz a day when it's hot. With people on the keto diet, I am reading about their rash and it sounds just like mine! Any ideas? Steroids slow down healing so I can't take them, plus raise my blood sugar.
OH! I am yes a type 1 diabetic on an insulin pump with a sensor! My insulin daily usage has went from about 35 units per day down to 18 units per day average. Love my sensor!