More than 1 sample in each individual
Number of samples in each individual:
2
All patients are divided into two groups a and b by simple randomization and individually based on the random table of numbers. In group a, in atrophic acne scars, one half of the face is injected with platelet-rich plasma, and in the opposite half, simultaneous injection of platelet-rich plasma and non-cross-linked hyaluronic acid is performed. In group b, in atrophic acne scars, one half of the face is injected with non-cross-linked hyaluronic acid and the opposite half is injected with platelet-rich plasma and non-cross-linked hyaluronic acid.