A dark neck, medically known as Acanthosis Nigricans, is a common skin condition characterized by the darkening and ...

For many, black marks or dark patches on the skin, particularly around the neck, might appear to be harmless discolouration.

Also, since they are large and severe, they can last for 1-2 weeks and leave behind red, dark scars ... Jawline breakouts and spots on your neck usually happen around the time of your period.