Hi, the horizontal line on your neck is not the disease. But, it may be due to fold constastantly remaining due to wrong posture, you are right. Do not worry. Keep neck in good posture. Do not rub or scratch it, other wise it will become prominent. Wash the neck with
vitamin C,
glycolic acid and kojic acis containing face wash twice a day. Rub the cream containing vitamin C ans
kojic acid. Take vitamin C ,
vitamin E and glutathion for long time till you get improvement. However,
consult dermatologist and make sure that there is no internal disease. Avoid sun rays, soap bath and beauty cream.. etc. I hope you will get improvement. ..ok