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Zippering (fruit disorder) on tomatoes. This disorder (abiotic disease) happens when the flower anther sticks to the developing fruit as it grows. Characteristic symptom is a thin brown longitudinal scar with transverse scars resembling a zipper. It extends down the fruit. There may be more than one scar on a fruit. An open hole may develop next to the scar.
When it begins to ripen during a spell without water, the outer skin will thicken and toughen up. A sudden influx of water will cause the tomato to swell (or continue growing) on the inside. This inner swelling will then cause the thickened outer skin to rupture resulting in a split or crack.