Many people suffer the embarrassment of having dark skin patches around their neck. This is a fairly common skin pigmentation disorder known as acanthosis nigricans. It is not an infection and is not contagious.
Aging and sun exposure are the main causes of dark discoloration on the neck. Other causes are diabetes, genetics, polycystic ovary syndrome, poor hygiene, and sudden weight loss or weight gain.
There are many natural remedies to reduce the discoloration of skin around the neck.