Dysport caused sunken under eyes and saggy lower eyelids, will this resolve on its own? (photos)

The dysport is definitely gone 1 year later so this is not due to the muscle still being knocked out. However, it is possible that whatever dose you got was strong enough to atrophy the muscle enough underneath that you have decreased volume there vs. that you are still aging and was always going to lose volume in your periorbital area anyway (judging by your upper eyes and brows too). So it's hard to say what caused it ultimately. Your treatments going forward would be considering adding back volume and possibly peel/laser for the fine lines.

I'm sorry to hear of your issues from your Dysport treatment. One year after treatment the effects of the Dysport are gone and your results will not likely change. You may want to consider filler to help improve under eye contours. I've included a video on this that I hope you find helpful.

For unique cases where a variety of modalities could be used to treat the condition, I would suggest an in-person or virtual consultation to develop a custom and effective treatment plan. It is difficult to precisely define the best option without collecting the same information. I suggest reaching out to an expert for a consultation with surgical and non-surgical methods to get a comprehensive option. Best, Dr. Emer.