Pharmaceutical production enterprise license is something that enterprises need to apply for. Now pharmaceutical enterprises require GMP certification. It will cost millions at least to set up a pharmaceutical enterprise.
But, you can It will cost much less to make the plaster into a Xiaoxiao or Jianxiao.
I would like to give you another suggestion. A more realistic approach is to contact a local pharmaceutical factory with a production license for external use drugs. Take a look. Can we produce in their name? It would be easier.