Stretch marks appear when your skin expands quickly and tears the inner layers of the skin, causing pink, red, or purple streaks. (momtricks.com)
Red light can reduce your sebum production and clogged pores, UNLESS the intensity is too high, in which case your inner layers of skin will dry out and sebum production will shoot up. (supernaturalacnetreatment.com)
As we age, the dermis, which is the inner layer of skin, thins and cells divide less. (consumerhealthdigest.com)