Melanosis on the neck may be caused by hormonal changes in the body, ultraviolet radiation or acanthosis nigricans.
1. Hormonal changes in the body: During pregnancy, the increase in estrogen and progesterone levels in the body can lead to an increase in skin pigmentation, which is manifested as darkening of the armpits or neck.
2. Ultraviolet radiation: ultraviolet irradiation of the skin can stimulate melanocytes to synthesize and secrete a large amount of melanin, and if the patient is not properly protected from the sun, it can cause darkening of the skin of the neck.
3. Acanthosis nigricans: due to low immunity, use of hormonal drugs or obesity or even visceral tumors, it is mostly seen in the neck or armpit skin, which manifests itself as darkening and thickening of the skin accompanied by itching.
Patients should go to the hospital in time, under the diagnosis of the doctor to determine the cause of the disease, according to different situations to take the appropriate treatment for treatment.