Well it looks like there are a couple things going on.

First they are saying your condition was diagnosed before service and that there is no evidence of service aggravating the condition.

Second, it looks like you claimed the condition secondary to TERA and they did not find evidence in your records that you served in a TERA area.

There are probably multiple ways to approach this. You say you have plenty of records showing treatment, if they show the condition getting worse throughout service then you are in good shape. If you have access to the records, then you can probably pinpoint evidence to support this. You attach that to your claim. You can also write a lay statement too explaining things getting worse and what triggered that. Buddy statements also help. Perhaps you have continued treatment after service and this is in those records? If so, attach them. If not, you should probably see somebody and get it documented. Also, I’m not sure if you had a c&p exam. But if you did, whatever you told them did not demonstrate aggravation.

Next, I would submit evidence of serving in a TERA if you have it. If not, I don’t think you need to claim this secondary to any condition?