How would you treat this lesion on the sole of the foot?

This case discussion from Dr David Stewart features a 39-year-old female patient who presented for a skin check with a new lesion on her foot that she had noticed only two weeks prior. She has no history of skin cancer.

What do you think? What would you do next?

Update

Dr Stewart arranged for the patient to return for a biopsy, but when she returned three weeks later, the lesion had completely disappeared! No biopsy was performed.