Can basal or squamous cell carcinoma be as small as 1mm wide?

Yes: All cancers start as one cell being malignant and all cancers go through a stage where the lesion is 1.0 mm wide. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Drink enough water daily so that your urine is mostly colorless. Practice safe sex.

Yes: Every cancer starts as a few cells. A dermatologist with a good eye can spot them this early.