Blossom end rot. That's a hard one to treat. You can try adding calcium to the soil. But most soil has enough calcium. If your soil wasnt hard packed and decent then i would consider watering. Extremes in the watering whether its too much or too little stresses the plant. Tomatoes particularly like even moisture like the consistency of a moist chocolate cake. Also too much nitrogen causes too fast a growth and effects the calcium utilization. During bloom i only use high phosphorus fertilizer that has little nitrogen. And i give a smidgeon of magnesium. Ultimately it comes down to how the plant isnt utilizing its calcium but the mechanism is usually from the above issues. Once the plant has it its hard to "cure"
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