What are the pros and cons of skin resurfacing?

Depends on depth: And technique. There are many options for resurfacing from chemical to mechanical to energy application (laser, heat, light, ultrasound, etc). Depending on the depth and technique risks can range from none to hyperpigmentation, hyperpigmentation, scarring, atrophy, depression, hypertrophic, keloid, photosensitivity, redness, pain., herpetic eruptions, and more.