Can't say for sure from the photo but it appears to be Early Blight in the very early stages, combined with some mild environmental damage. EB is quite common in most of the country and something we all have to deal with much of the time.

You can treat EB with fungicides as most do or you can just let it run it course and remove the worst affected leaves to slow its spread. It usually doesn't kill the plant unless it becomes quite severe and yours isn't and it continues to produce. There is no reason at all why you can't harvest and eat the peppers.

Thanks a lot!