The viscoelastic properties were significantly influenced by aging. Also, significant regional variations in the viscoelastic properties were observed. Skin elasticity measurement is useful for the quantitative evaluation of age-related changes.

A long pulse duration 595-nm PDL was found to improve acne erythema with minimal discomfort and an increase in skin elasticity.

The red fluorescence area showed a stronger correlation with sebum secretion than with the presence of P. acnes. This finding suggests that the red fluorescence is affected by sebum not just P. acnes.