I used the larger chunks. you can use. smaller ones too. I made a poultice with it. cotton soaked in the solution and kept a new one on every couple days. You could probably use a blender and make a paste too. I used a large bandaid to hold it on. It has never returned either.
I used Eggplant cream on my husbands back with skin cancer on it. In about 2 weeks it disappeared. This has been used in Australia for years on cattle with skin cancer. https://onejive.com/make-homemade-eggplant-cream/
here's one