Possible causes of melanin deposition on the neck include sunburn, acanthosis nigricans, internal diseases and other diseases.
1. Sunburn: If the patient does not pay attention to strengthen the sun protection measures when going out, the neck area is exposed to excessive ultraviolet radiation, the basal layer of the skin cells to produce and accumulate a lot of melanin, which is manifested as more obvious melanin deposits on the neck, and will also lead to redness of the skin of the neck, skin and other symptoms.
2. Acanthosis nigricans: Acanthosis nigricans is a rare skin disease, which can be manifested as deepening of skin color in the neck, armpit and other parts of the skin, dry and rough skin, velvety appearance, and the possible causes of the disease are obesity, insulin resistance, tumors of the internal organs (such as gastric cancer and other adenocarcinomas), etc., therefore, the melanin deposits on the neck may be caused by acanthosis nigricans.
3. Internal medicine diseases: some internal medicine diseases will affect the melanin metabolism in the body, when the melanin metabolism function is seriously impaired, it will make the neck, armpits, abdomen and other parts of the more obvious melanin precipitation, for example: a variety of adrenal-related diseases (Addison’s disease, etc.), liver diseases and other internal medicine diseases, so the melanin on the neck precipitation may be caused by the above diseases.
In conclusion, it is recommended that patients with melanin deposits on the neck go to the hospital for timely treatment to avoid further aggravation of the condition.