My oily skin suddenly become dry 😭

I started tretinoin for my hyperpigmentation 3 weeks ago and i just use it once a week(monday night). But at 2nd week, i used cosrx bha power liquid two days later and next morning my skin become dry and start to peel (like soft one,only visible when i apply sunscreen) I have never be a dry skin type and dont know what product (serum/toner/essence) to help with it. This week i only use cosrx galactomyces, propolis serum, and oil free moisturizer from cosrx Can you help to reccomend me others product to help since my skin still feel dry inside but not peeling anymore