is a tca 20% considered a light superficial peel or a medium depth peel? And should one start at 20% or can I start higher maybe 30%? I had glycolic peels before but never have i had a tca peel. Also i am mixed with black and white i have olive skin considered lightskin with mild acne scars but really bad uneven skintone would i be a good candidate for a tca peel?