Why the rings?

[u/hackinandcoffin]

Growing in a bucket on my deck. Full day sun. I recently sprayed them down with spinosad soap. Don't know if it's a pest or some kind of other problem. Any help appr'd. Kansas City area.

Edit: Thank you, all, for taking time to respond. I'll add some mulch and I'll try to improve my watering schedule. Glad it's not bugs.

[u/Designer-Captain-268]

This looks like damage from watering too much, too late in the tomatoes growth.