My face is swelling up 1 day after using Cosmelon. Getting nervous as bruising is starting under my eyes. Is this normal?(photo)

Did you have eyelid surgery as well? It looks like a freshly sutured incision over your upper eyelids in the photo. Even if you only had your UPPER eyelids operated on, you can often get bruising and swelling under your eyes. A bit of swelling w/ Cosmelan is normal, but yours is definitely on the more extreme side. Ask your surgeon or clinician who applied the Cosmelan to differentiate between normal swelling from Cosmelan and a possible reaction. I have never seen bruising from Cosmelan. 

It appears you are allergic to something in the Cosmelan and most likely it's the hydroquinone. This is rare but it is what I suspect. See a physician for a prescription and a kenalog shot quickly. And stop using the product!"This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."