Eggplant Problem

Question

All my eggplants have the same problem…a kind of leathery surface on the bottom.

Answer 1

Is it hard or soft in nature? I suspect a blossom end rot issue, similar to that found in tomatoes. This article will help: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm