Well, typically BCCs grow very slowly, but there are occasions when they grow fast.
If a person's immune system is compromised (i.e. from medications or generic disorders), BCC can grow faster. If the cancer has been there for 5 years, typically it's bigger than a dime, but again it's hard to say.
Each person's BCC grow as different rates. I'm a Mohs surgeon and have seen thousands of BCCs.




