I would like to stop having biohorror transformation dreams, but also I never dream, so it's fine.
I think it's because I keep thinking about invasive plants and infectious spores and highly toxic sap. There are many kinds, but...
Think about plants like the giant hogweed.
It projects itself out like a nuclear explosion. Just touching the plant can cause severe rashes, blisters, and scarring.
There are so many plants like this that look so harmless, but are dangerous chemical attacks instead.
Not all of them have the telltale warning sign of toxins, the red streaks displayed on them, threaded through the green. The hogweed's stem isn't always splotched with red.
So my dream involves these kinds of plants. Not this exact plant, but plants that contain inky black contaminants that continue to spread throughout the human body.