by chance can you snap a picture? To me it sounds like blossom end rot, which is a deficiency of needed minerals, or brought on by uneven watering (too much here and there or too long in between watering)
I use Espoma brand fertilizer for my whole garden. its a great source for the needed minerals
plants need, and if you look close enuff at any of the other (miracle gro for example) fertilizers, they lack calcium. . . . which is the biggest thing people talk about Blossom End Rot. The
plant is more than likely fine if its BER, but you cant eat the food they yeild. pitch them and NOT into the compost pile
Good luck and post a few pics if u can.