What makes an additional credential LPN needed to become a nurse massage therapist?

There is no fast track. Being a massage therapist school is different from being a nurse. You have to go back to school and start to get a degree in massage therapy.

Certification 6 - 9 Months

Most certification as a massage therapist can be done in about 6-9 months. You do not need a true associate degree. I honestly do not think there is such thing as a "nurse massage therapist. " It would simply be an LPN who is also a massage therapist, as well as legal assistant / paralegal who was also a massage therapist could be that, not just a "Paralegal Massage Therapist. "