Can I Buy Cosmelan 1 Online and Have a Doctor Apply It for Me?

I would advice you not to buy medical grade products online. Cosmelan should be ordered by a physician after he or she has evaluated you and has determined you need Cosmelan and it should be ordered and purchased from a reputable pharmacy or company that manufactured Cosmelan.

Absolutely not. Most medical providers wont allow to bring in your own product and suggest you purchase cosmelan at the office youre going to be receiving your treatment to be safe

We would suggest that you purchase the product through the physician and practice that you are considering for treatment.  Most practices would not allow you to bring your own product inasmuch as one should understand that there is value in the service being offered which includes the product.  As a patient, you are investing in a treatment plan and the value of this is more than just the price of Cosmelan.