Figures & data
Figure 1 Variation of the mean number of LEP, MEP, and HEP during topically applied vitamin C-based therapy.
Abbreviations: HEP, high echogenic pixel; LEP, low echogenic pixels; MEP, middle echogenic pixel.
![Figure 1 Variation of the mean number of LEP, MEP, and HEP during topically applied vitamin C-based therapy.](/cms/asset/5c54415c-4437-471e-81d1-2ff9e141d64d/dcci_a_84903_f0001_b.jpg)
Figure 2 The variation of age-dependent ultrasonic key markers at days 0, 40, and 60 of vitamin C-based therapy. A significant increase in the hyperechoic pixels is noticed in all age intervals throughout and after topical vitamin C therapy.
![Figure 2 The variation of age-dependent ultrasonic key markers at days 0, 40, and 60 of vitamin C-based therapy. A significant increase in the hyperechoic pixels is noticed in all age intervals throughout and after topical vitamin C therapy.](/cms/asset/cf7b47ca-3dc7-4b66-86f8-8d70d9076f65/dcci_a_84903_f0002_c.jpg)
Figure 3 The variation of LEPs/LEPi ratio indicative of the dermal density according to phototype.
Abbreviations: LEPs, low echogenic pixels in the upper dermis; LEPi, low echogenic pixels in the lower dermis.
![Figure 3 The variation of LEPs/LEPi ratio indicative of the dermal density according to phototype.](/cms/asset/8de716c2-01ea-433e-9d9e-e7d9d1d784fa/dcci_a_84903_f0003_c.jpg)
Table 1 The variation of the ultrasound parameters at days 0, 40, and 60 of topical vitamin C-based therapy, according to the three studied age intervals