Is it common to always have to return to my clinic for a touch up?

While your provider is marking these areas as close as he or she reasonably can on the chart, there are some patients who have very specific wrinkles and anatomy that make it difficult to achieve a perfect or near perfect result every time. If he or she is offering you a touch up for free, has reasonable pricing, and quick treatments, I would continue with the same provider.

I think it's great that your plastic surgeon wants to make sure his work is perfect. It sounds like he likes to be super safe with your injections as to not overly "freeze" you, as this would leave you unhappy for 3-4 months while the Dysport wears off, rather than the minor annoyance 2 weeks later to add slightly more dosage. It sounds that you have a good relationship with him, so try talking to him about the risks/benefits of increasing the dosage during the initial injection and see if that corrects the issue.

Most injectors will offer for a patient to return two weeks after treatment for any touch up if needed. Many times it is not needed. If you have concerns I encourage you to discuss them with your injector to hopefully decrease the necessity of follow ups since you see the same provider regularly.