Is it normal for cheeks to turn yellow 3-4 days after ultherapy?

Bruising is a rare risk of the Ultherapy procedure, but it can happen sometimes to those with thinner faces or who have a tendency to bruise. It's even less common for it to happen on the cheeks. Nonetheless, the yellowish nature of the bruise means that it is resolving. Most bruising completely goes away by about 7 days. If you are concerned you should schedule a follow up with your treatment provider. Best of luck to you.

I would say that bruising is not common after an Ultherapy treatment, but it is possible.  Sometimes bruising can be black and blue, but sometimes it can also be yellow or green. Usually, if it is yellow or green, it will fade away faster than black or blue.  If you have any concerns after your treatment, I would recommend contacting the physician who treated you.  

Bruising after Ultherapy can occur although it is not very common in our practice. We have noticed that patients with thinner skin or who are more prone to bruising easily have the most trouble with this. With patients who fit these categories we try our best to have the patients refrain from taking any inseds (advil, asprin, ibuprofen, etc.) 2 weeks prior to and 2 weeks after having an Ultherapy procedure performed. We also recommend that patients stay away from fish oil, vitamin e, and any other herbal supplements they may be taking for the same time period. In the event that we anticipate a patient will have a higher incidence of bruising we try our best to make sure the patient is using arnica montana both topically and orally to get them back up and at it as soon as possible post procedure.