Neck dermatitis is still red after healing is caused by pigmentation and other reasons, the recovery time needs to be judged in conjunction with the patient’s actual condition, it takes about 3 to 6 months. Neck dermatitis is generally due to the process of dermatitis, inflammatory substances stimulate the epidermal melanocytes to synthesize melanin, so that melanin increases, and then transferred to the surrounding keratinocytes, pigmentation occurs. For pigmentation caused by abnormal red spots its recovery time is not necessarily, patients do not need to carry out special treatment, because it can be discharged through the body’s metabolism, usually in about 3 to 6 months can disappear. Neck dermatitis in the time of occurrence must pay attention to avoid the relevant parts of the skin hard scratching, pay attention to sun protection, avoid hot water scalding and other stimuli, otherwise it will aggravate the pigmentation. If hyperpigmentation occurs once after recovery, good skin care should be taken. If the above situation occurs, it is recommended to go to the hospital in a timely manner, avoiding self-treatment, so as not to cause adverse consequences.