This is called "Green Shoulders" and it can happen if the fruits are exposed to too much direct sun (ex. plants were pruned excessively) or too high temperatures for an extended amount of time. You could try picking the tomatoes that are doing this and let them further ripen indoors. If you don't want to remove and ripen inside there isn't anything wrong with them. You can still eat them. Just cut the green shoulders off :)
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