Does Hashimoto's Thyroiditis Cause Skin Rash On Neck?
Sorry to note your skin problem.
Hashimoto's thyroiditis does not cause a skin rash.
It is likely a different skin problem for which a dermatologist needs to be consulted. Treatment will be directed at the cause accordingly.
When I see someone like you in my practice, I typically order the following blood tests in addition to a detailed physical examination:
CBC (Complete Blood Count, also known as Hemogram; includes Hemoglobin, WBC and Platelet counts)
Electrolytes (Sodium and Potassium in particular)
HbA1c (Glycosylated Hemoglobin = your 3 month glucose average)
Liver function tests (SGOT , SGPT, Albumin, Bilirubin, Alkaline Phosphatase)
Kidney function tests (BUN, Creatinine)
Serum Quantitative thyroglobulin
Anti Thyroglobulin antibodies
25 hydroxy Vitamin D
Ultrasound of the neck
Stress induced skin lesions are possible/ Again, it is the expert opinion of a skin specialist that is required with the opportunity to examine it too.
To be sure that your other symptoms are not due to thyroid issues, just make sure your TSH and Free T4 are in the target range