Been doing some research but still have a few questions. Will it darken hair color as well as skin tone?
No, just your skin-tone and freckles/moles to a degreeAnd also, I've read it will darken birthmarks
Not that I noticed, my birthmark stayed the same; will it do the same for dark circles under your eyes?
Not that I noticed, nor have I heard of it doing this to others. Get more sleep maybe?
Almost forgot, one last question. Heard it'll make your skin red for awhile, especially after the first injection. How long does it take for the redness to fade?
Redness around injections spot for 30mins or so but not skintone.