Melanoma biopsies are not typically “small pieces of skin”.

Any other kind of biopsy will be unreliable and is more likely to be a waste.

How are you basing detection rate on that information? Hint: you can’t. Or if you are implying that detecting 1 case in 52 cases of melanoma is good (a sensitivity of 2%) then you’re nuts.

All medical students and dermatologists train on the basic guidelines for skin cancer screening. Please leave this to the professionals.