There are two risks associated with the procedure.
First is spotting. Since waxing pulling down the hair from the root so tiny skin damages are unavoidable, but it is shortly invisible after a day. Large skin damage is yes, but when it comes down to the skill and experience of the aesthetician the risk is quite low. I have been in waxing business more than 8 years and I have never seen this happened.
Second is infection since waxing leaves multiple tiny opening wounds for a short period of time, enough to get infected if the waxing area is not treated well. I always wear glove, and apply pre- and post-waxing treatment to moisturize the skin and to reduce the risk of hair in-grow and infection. And lastly no double-dipping as I never use the same stick twice, minimizing the risk of cross contamination. My client usually buy finipil® for post waxing treatment from my spa. It is a topical ointment that you can apply on the waxed area after showering. It is FDA approved as over-the-counter antibiotics to prevent infection, ingrown hair; while moisturizing and soothing the skin, so I highly recommend this.