Hyperpigmentation Under Both Eyes After Blepharoplasty. What Are My Options? (photo)

Removing lower eyelid fat changes how the pigmentation in the lower eyelid appears.  It is possible that an appropriate chemical peel might help you.  IPL will not work here because the pigment is too deep to be reached by the IPL treatment.  For the same reason the skin creams will be ineffective.  Lower eyelid skin is thin for this reason, I personally would not use a trichloroacetic acid agent stronger than 35%.  However, phenol 89% is an agent that I often use for lower eyelids.  A very helpful alternative is to fill in the tear trough with Restylane which can help the dark area look better.

Yes the hyper pigmentation shows in your posted photo. Try IPL but I might suggest a deep peeling either 70% TCA or modified phenol. 

What you are seeing here is likely a combination of true skin pigmentation and residual blood products from the bruising. The blood product pigmentation will improve further with time. You could consider some skin bleaching creams as well. Consult with a dermatologist.