It's been a week since facelift. Is this necrosis? (Photo)

I do not believe it is frank necrosis, but it does appear to be epidermolysis. If taken care of adequately, it should heal well. Necrosis is when there is full thickness skin death.

Dear christine12001,Thank you for your question. It is difficult to perform an assessment based on photographs alone. I recommend continued closed follow-up by your surgeon with repeat serial exams. If the issue is skin necrosis, it can usually be managed and resolved with antibiotics and a wound care regimen. 

Dear Christine,From the photo you've provided a patch of darker skin does not seem to be necrotic.  Minor skin ischemia is not uncommon after a facelift and in majority of cases goes away without leaving any visible skin marks.  Please follow closely your surgeon's wound care recommendations.   With good care you should expect the area to heal within the next 2-3 weeks.Best wishes!

Dear Christine12001,I am sorry to hear and see that you are having some difficulty with healing. Based on the picture provided, I can't tell exactly what is going on, but it looks like there may be some degree of necrosis. Be sure to stay in close touch with your Surgeon as you get through this process.Thank you for your question, and please let us know if you have any other questions or concerns!Sincerely,Dr. P Daniel Ward

This could be indeed severe skin suffering with early ischemic changes. Tension relief, topical antibiotic cream and some blood thinning measures can help mitigate possible damages.Christian Drehsen, M.D.