In addition to a neck rash, thyroid irregularities can cause various skin-related symptoms. This is because the relationship between the skin and the thyroid is quite significant, Dr. Kopelman notes.

Baby neck yeast infections are a kind of skin rash that can happen to babies of any age. They’re most common in babies under 4 months old because they have more neck skin folds. Yeast or fungi ...

Thyroid-related rashes most commonly appear in the creases of the skin. “A rash that could be linked to thyroid problems might look like red, inflamed patches on the neck that are either dry or ...

Mono rash is one symptom of the viral infection, mononucleosis. The more common symptoms are fever, fatigue, and a sore throat. If you have these symptoms and a rash, see your doctor.

A heat rash is characterized by stinging or prickling skin and is exacerbated by sweat. You'll usually notice a heat rash appearing on your neck, scalp, chest, legs, and elbow crease.