It is first seen as multiple very small, black pimples or pustules under the fruit skin before they break through the covering. Then a black conical  protuberance appears, which is the spore-case of the fungus.
At first, the issue presents itself as numerous small, dark spots or blisters just beneath the surface of the fruit, eventually bursting through the outer layer. Following this, a black, tapered growth appears, serving as the spore-producing organ of the fungus.