Answered by Shaykh Faraz Rabbani
Can you please tell me if it’s permissible to use topical skin medications on the skin, such as Retin-A, that are ABSORBED by the skin, when one is fasting?
Walaikum assalam,
In the Hanafi school, such medication would not affect your fast in any ways. In fact, even injections do not break the fast.
Wassalam,
Faraz Rabbani.