u/Different-Finance782

I keep buying skincare from Amazon because its cheaper and I get it in 2 days but lately I've been seeing posts about counterfeit products on there and now im like paranoid. My cerave from amazon has slightly different packaging than the one from target. My The ordinary serum came in a box that looked a little off and it could be nothing but could be fake products on my face as well. Do you guys buy skincare from Amazon or is that a bad idea? How do you even tell if a product is fake and if ive been using counterfeit products for months have I potentially damaged my skin?