Looks like blossom end rot on the right. The left might be considered cat-facing. I know a little bit about BER. Ultimately it involves calcium, but lower magnesium somehow affects the calcium uptake. Some people add epsom salt at planting or early broadcast but you need to be careful not to overdo it. I will add a tbsp/gal to my copper treatments once early in the season.Once BER occurs, you may be able to fix it by dusting with agricultural lime. Long term a good idea is to get your soil tested and then amend it. States usually have free soil testing through ag. extension or at state universities. BER occurs on the blossom end from my understanding. Also suggested as a factor is watering periodicity but I haven't seen a definitive explanation of why and I can only gather it is irregularity in the number of days.
Cat-facing is sometimes suggested to be from insect damage maybe even bird peck. I find it seems to happen a little more frequently with specific varieties, usually the convoluted less smooth types, like Costolutos as an example.