What’s wrong with my pepper?

What’s wrong with my pepper?

I've never had very good luck growing peppers, so I was excited when this year's pepper plant seemed ready to produce a healthy crop. Then, as the peppers started to mature, almost all of them began to show brown spots near the bottom that grew and became sunken over time. This photo shows both an advanced case and one that's in the earlier stages. As you can see the rest of the plant appears healthy: I've never encountered this problem before. Does anyone know what could be causing this? What can I do to resolve the problem? If it helps, I'm growing the plant in a container on my deck where it gets very full sun. I live in Philadelphia--zone 6. Thanks!
My room

My room

Help! stunned baby blackbird

Help! stunned baby blackbird

SWISS STEAK-PAULA DEEN…..

SWISS STEAK-PAULA DEEN…..

My garden in June

My garden in June

what is it?

what is it?

Spanish Lavender and grass choked roses in California

Spanish Lavender and grass choked roses in California