Clinical efficacy of intradermal type I collagen injections in treating skin photoaging in patients from high-altitude areas

Figure 1 Skin ultrasound images. Dermalab SkinLab Combo ultrasound probe can be used to obtain skin cross-sectional images and skin thickness values based on different sound level signals. The brighter the color in the image, the greater the density of the area, which indirectly reflects the density of subcutaneous collagen. Skin ultrasound images showed that the skin thickness increased after six treatments compared with baseline. A: Before treatment; B: After the first treatment; C: After the second treatment; D: After the third treatment; E: After the fourth treatment; F: After the fifth treatment; G: After the sixth treatment.