Lower eyelid surgery would be contraindicated if the kidney transplant has caused fluid retention around the eyes and not fat. If fatty tissue around the eyes is causing the appearance of an eye bag, then blepharoplasty would be indicated.
The key factor is whether your nephrologist would clear you for surgery and what anti-rejection drugs you are on. This is a very individualized issue and each transplant patient has his or her own medical issues. Blepharoplasty is performed under IV sedation at most. Alternatives would include Restylane or Selphyl for lower lid rejuvenation.