Pest or other problem?

[Travelscribe]

This is my first season growing tomatoes and I would love it if someone could help with the pictures below.

I pulled my first Black Cherry tomato this morning with the goal of tasting it to see how long to let the rest of them go before picking. When I did so, I discovered a dried out hole near the stem.

I'm not sure if it is a pest, or just a natural deformity...

Thanks in advance for your help!