I've had about 12 BCC's removed in a short space of time from my back and chest. I've now also had my gallbladder removed. Gallbladder bile breaks up fat and fat carries fat soluble vitamins A, K, E and D around your body. So if GB not working properly leaves you open to things like this. You need A especially for healthy skin and immune system... so there is sometimes an underlying cause. In my case the quantity of BCC possibly linked to GB problems. I've not had any further BCC since. Bodies are amazing things. I've been told to supplement with B3 and I also supplement now with A, K, E and D.