Can tretinoin, kojic, glycolic acid be used together on the face on different days?

Thank you for your question.Combining those topical creams have a potential of causing redness or irritation, so starting with alternating days of using them will help. Also, I suggest applying the creams to a small test spot first and after a few weeks, if there is no irritation, then you can try the entire face. I highly recommend you consult with a board certified dermatologist to have your skin evaluated and to discuss treatment options that best suits your needs. Take care and good luck.