Can ectropion be revised easily after lower blepharoplasty?

It all depends on severity of the ectropion, if it is mild it usually is resolved by massage and time. sever cases will need surgery. 

Need to see photo of your eyes to better help you. It depends on severity of the ectropion and healing process. Communicate with your surgeon and see an oculoplastic surgeon. Revision lower eyelid retraction surgery may be an option.

In some cases, yes time can help resolve the ectropion. In other cases complex reconstructive surgery is needed to fix these. At 7 weeks, it is highly likely that you will need reconstructive surgery to address this issue. Study the attached video which describes how these are fixed.