The term dermoscopy describes the examination of skin lesions using magnification with oil or polarising filters.

Dermoscopy Atlas
The majority of lesions in this book are shown with the naked-eye, magnified, and dermoscopic views alongside each other.

Dermoscopy: the alternative atlas
This free book is a light-hearted celebration of other-interesting-images-that-have-been-taken-with-a-dermoscope.

Skin Tumour Atlas
This diagnostic atlas contains hundreds of images showing the diverse appearances of benign and malignant skin tumours.

Minor Surgery Series
These books deal comprehensively with surgical techniques and surgical procedures, and include numerous videos.
Every large and obvious malignant skin tumour
was once a tiny innocuous dot. Therefore, the emphasis must be on diagnosing skin cancers when they are small and not so obviously malignant.
DERMOSCOPY: melanoma, moles & skin tumours