Points along Luo channels were the earliest treated points in acupuncture. Collaterals of the primary meridians, they are visible reservoirs for pathology. When the Wei level of the body has become incapable of releasing a pathogenic factor, the body holds it.

 

Luo vessels will then contain the pathological factor in a minor blood vessel network on the surface of the skin in such formations as spider veins, varicosities, swellings & nodules; thereby preventing deeper movement into the primary channels and organs.