According to Orgclinic.com, dark pigmentation around the skin can be caused by a medical condition called acanthosis nigricans, a hormonal imbalance, eczema, a fungal infection, diabetes, certain liver disorders and sunburn. Friction can also cause skin to become thick and dark, most often found on the neck of morbidly obese people.
Although dark skin around the neck is not something to be concerned about in most cases, it can indicate the presence of a medical condition such as diabetes. It may also indicate that the presence of an intestinal or liver disorder or infection. A certain type of fungal infection called tinea veriscolor may also be the culprit and requires medical treatment, says Orgclinic.com. For this reason, a medical evaluation should be performed to determine the cause.
Hormonal imbalances such as those experienced during pregnancy and as a direct result of poly-cystic ovary syndrome can also cause the neck to appear dark in color. However, medical treatment is only necessary if the hormonal fluctuations are caused by a disease or disorder, such as ovarian cysts.
New Health Guide recommends gently exfoliating and moisturizing the affected area. Certain home remedies such as lemon juice, aloe vera, yogurt and cucumber may also help brighten darkened skin.