I also notice that some of your plants leaves have brown spots and are yellowing.
48+ Black Spots On Pepper Plant Leaves. If there are black spots on just the fruit, the cause will most likely be environmental, and, often, this is due to inconsistent watering. Certain plants are more sensitive than others.
My Pepper Plants Have Curled Leaves With Brown Spots Ask An Expert from ask.extension.org
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In cultivation, a trellis is used to support the plant.
Black edges on leaves of a pepper plant can indicate a bacterial disease, such as bacterial leaf spot, which appears as small, irregular spots along leaf edges. As adults, these pests damage plants by feeding on leaves, soft fruits, shoots and blossoms. In general, spots are dark brown to black and circular on leaves and stems. Black pepper plants are used to produce black, white and green pepper.