This invention provides illustrations that can be used as educational materials for teaching massage treatment, dermatological therapeutic techniques, dermatological diagnostics, etc.; and methods of performing and teaching massage treatment, based on new anatomical findings about cutaneous blood vessels. The illustrations have a 1st illustration, which displays anatomical characteristics of the skin, including the position and state of the cutaneous veins and valves within the veins. The method of teaching the massage treatment uses the aforesaid illustrations as teaching materials. The massage treatment includes a procedure (A) that comprises pressing, towards their respective plexuses, the thin vessels ascending from the deep dermal venous plexus and/or the subdermal venous plexus, which are formed in the deep dermal layer and/or immediately below the dermis by veins unaccompanied by arteries.