Darkening of the neck after itching is considered to be due to post-inflammatory hyperpigmentation. Post-inflammatory hyperpigmentation usually belongs to the skin pigmentation symptoms secondary to the skin after acute and chronic inflammatory processes. It is mainly manifested as light brown, dark brown spots and patches on the surface of the skin. For example, the presence of acne, skin inflammation, herpes zoster, urticaria and other conditions can cause inflammatory reactions in the skin, which in turn lead to the appearance of post-inflammatory hyperpigmentation. In the case of darkening of the neck after itching, the diagnosis of hyperpigmentation can be confirmed with the option of temporary observation or the option of further treatment. Inflammatory hyperpigmentation disease is slow and can disappear on its own in most patients, so it can be temporarily observed. If you feel that it affects the aesthetics, if necessary, you can also cooperate with the doctor to choose laser treatment to lighten the pigmentation. There may be other reasons for the darkening of the neck after itching, so it is necessary to cooperate with the doctor to do further examination in order to make a clear diagnosis, and then do the treatment.