Although, you had this lesion for long time you don't need to worry. Basel cell carcinoma is very slowly growing and typically does not spread to other body parts. Basel cell carcinoma usually is able to invade and destroy the surrounding tissue, but very, very rare can give some metastases. Surgically or with a intralesional injection of interferon, basel cell carcinoma is highly curable.
Don't worry! You should only be aware that there are some chances when you already had one BCC lesion, others BCC lesions to develop over the years. This type of cancer is highly connected to life sun exposure, so in future, you should systematically look and feel for any changes in your skin, wear protective clothing (long sleeve- high-density cool shirts/blouses) and hats when outdoors, wear 100% U.V. protective sunglasses(face skin is very common place for BCC to develop), avoid intensive sunshine during the day(10-14 hour) and high factor sunscreens.
You'll be fine!
I have couple of relatives with this skin problem(my grandfather, aunt and uncle) and they are living their normal life for years after the treatment.
Best wishes!
Marija