Directly below the lateral margin of the nostril, level with Renzhong DU-26.
How to locate
Divide the distance between the nostril and the upper lip into three section. Renzhong DU-26 is located on the anterior midline, at the junction of the upper and the middle third.
Kouheliao LI-19 is at the same level as DU-26, 0.5 cun lateral to it.