Darkness on the back of the neck may be caused by acanthosis nigricans, excessive exposure to ultraviolet rays, Cushing’s syndrome or medication factors.
1. Acanthosis nigricans: Acanthosis nigricans is caused by obesity or other reasons, such as tumors, which leads to darkening of the folds of the skin and velvety changes, resulting in darkness on the back of the neck.
2. Excessive exposure to ultraviolet rays: prolonged outdoor activities and excessive exposure to ultraviolet rays can lead to darkening of the exposed parts of the skin, resulting in darkening of the back of the neck.
3. Cushing’s syndrome: it can lead to skin pigmentation all over the body, causing darkness on the back of the neck.
4. Drug factors: due to disease, local topical glucocorticosteroids or oral glucocorticosteroids can cause darkening of the back of the neck.
You can go to the dermatology department of the hospital for consultation.