Thank you for your question.
Basal Cell Carcinoma (BCC) is the most common type of skin cancer and is due to recurrent sun exposure, but not related to the number of sunburns (although that definitely does contribute). A BCC tends to grow like the "roots of a tree". Usually it is slow growth, but what you see on the surface may not represent the entire tumor. The tumor can easily be growing underneath the skin and spreading, but you might not see most of it, and that's why you won't know how big the area taken out will be until the actual surgery.
To specifically answer your question, most BCCs will grow very slowly - usually only showing about 4-5mm of growth, plus or minus, every 6 months or so. But, it may be growing quicker underneath and that's what should be the main concern, especially in areas around the eyes, nose, and ears. You have had the BCC for 5 or more years, so it is very possible that a large area of tissue might have to be removed; only the surgery will tell.
I wish you the best of luck!



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