Table 1. Patients and details of each group.

	No. of patients (n=216)	Injection tool and size	Injection area	Injection volume	Needle direction
Group 1	54	30-gauge needle	Upper lip	0.6 ml	Top to bottom
Group 2	54	30-gauge needle	Upper lip	0.6 ml	Bottom to top
Group 3	54	30-gauge needle	Upper lip	0.6 ml	Lateral to medial
Group 4	54	23-gauge cannula	Upper lip	0.6 ml	Lateral to medial