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EMLA remains the most widely used topical anesthetic given its proven efficacy and safety by several clinical trials. There has been a recent release of several new topical anesthetic agents with some demonstrating efficacy after a 30-minute application time. A reservoir of anesthetic is located and stored in the upper skin layers during application, providing additional anesthetic benefit 30 minutes after removal. As the options for the practitioner continue to grow, the demand for faster onset, comparative efficacy, and safety trials will continue to be of paramount importance.

The presence of PPD in black henna tattoo mixtures in high concentration poses a health hazard and a risk of allergic contact sensitization with potential long-term consequences.

According to the reported worldwide adverse events data, hypersensitivity to nonanimal hyaluronic acid gel is the major adverse event and is most likely secondary to impurities of bacterial fermentation. According to data from 2000, the incidence of hypersensitivity appears to be declining after the introduction of a more purified hyaluronic acid raw material.

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