This irritation can take many forms, including redness, swelling, itching, and dryness.
Thanks to earlier diagnoses and treatment of thyroid diseases, this rash is now considered a rare symptom.
It still occurs in up to 4% of cases.

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Chronic Hives
Red, raised, and itchy skin can also be a sign of thyroid disease.
Other Skin Conditions
There are several other skin symptoms that can come with thyroid disease.
They also may experience itching and a rash calledHenoch-Schonlein Purpura, also known as IgAvasculitis.
They may examine your rash closely, or even take a skin sample to view under a microscope.
Treatment
The treatment for thyroid-related skin symptoms will depend on the underlying cause.
The most effective treatment for thyroid-related skin disorders is to get your thyroid imbalance under control.
You should not make a run at treat thyroid disease on your own.
Delaying or avoiding medical treatment for thyroid disease can lead to serious complications, such as an irregular heartbeat.
Summary
There are a number of skin symptoms that can appear with thyroid diseases.
Talk to your healthcare provider about rash symptoms, especially if you are already diagnosed with a thyroid condition.
Treating your underlying thyroid disease should improve rashes and help you avoid more serious complications.
American Academy of Dermatology Association.Thyroid disease: A checklist of skin, hair, and nail changes.
Selvendran SS, Aggarwal N.Chronic urticaria and thyroid autoimmunity: a perplexing association.Oxf Med Case Reports.
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October 2017;6(4).
American Thyroid Association.Hypothyroidism (underactive).