Can HCG Diet Cause Patches On Side Of The Body?

I'm on Day 28 of the hcg diet, and about 2 weeks ago I noticed a rash in one patch on my side that I believe looks like shingles. It was painful for a week or so but is now healing into scabs. Could the diet have caused this, and what do I need to do? No pain now, but I'm concerned about nerve damage. Thank you!