But here's the thing: sometimes, a neck rash can be a sign of something more underlying. For example, if you have a thyroid issue, you might experience skin problems, including rashes. Or, if you're deficient in certain nutrients, like vitamin B12 or iron, that could lead to skin issues.
Eczema rash on the neck - Stock Image - C008/3601 - Science Photo Library
And then there are the hormonal fluctuations that can cause rashes. If you're going through puberty, menopause, or pregnancy, your hormones might be out of whack, leading to skin problems. So, as you can see, there are a lot of potential reasons why your neck might be breaking out in a rash.