Some small eggplants are naturally streaked when they mature. Or, if your variety should be a solid dark purple, then it could be that the streaks are developing because the fruit is overripe? 'Patio Baby', for example, should be harvested when the fruit is 2 to 3 inches long. Overripe fruit usually becomes dull-skinned, and lightens. It can also discourage more fruiting.
Some small eggplants are naturally streaked when they mature. Or, if your variety should be a solid dark purple, then it could be that the streaks are developing because the fruit is overripe? 'Patio Baby', for example, should be harvested when the fruit is 2 to 3 inches long. Overripe fruit usually becomes dull-skinned, and lightens. It can also discourage more fruiting.