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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.
This inner swelling will then cause the thickened outer skin to rupture resulting in a split or crack. Although some minor cracking at the top of the tomato is generally harmless, large splits that expose the tomato flesh can invite disease and insect pests. If you look at the above picture you will notice the four tomatoes. The top two tomatoes have split due to inconsistent watering. The bottom two are not fully ripened but should be picked at this time. You can sit these tomatoes in a window sill that is in a sunny location to further ripen. This will keep them from cracking like the top two did.