The neck rings could also indicate a hormonal imbalance.
While this may be triggered by a change in medicines – such as steroids or the contraceptive pill – it could point to something more serioues.
Cushing’s syndrome, polycystic ovary syndrome or an underactive thyroid are noted as causes by the NHS.
In rare cases, acanthosis nigriacans can signal stomach cancer.
Both Healthline and NHS list AN as a symptom for this serious disease.
If you notice dark pigmentation on your neck, you should visit your local GP.
The NHS advises: “Although it’s usually harmless, it’s best to get any skin changes checked out.
“In rare cases, it can be a sign of something more serious, such as cancer.
“A GP can usually tell if it’s acanthosis nigricans by looking at your skin.
“You may need some tests if they’re not sure what’s causing the patches.”
- Type-2 diabetes
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