The arrival of qì.

In ear seeding the sensation of dǎ qì 打气 (‘the arrival of vital energy’) is a sign of correct seed placement and a desirable effect from the gentle pressing of seeds. Upon pressing, the sensation of dǎ qì can includes tenderness, tingling, numbness, heaviness, awareness of energy, warmth, mild throbbing, an electrical feeling and/or a spreading sensation. A sensation of warmth or heat is is the most desirable in terms of effective outcomes.

Source: PMID: 29122257