In thermolysis, topical anesthetics should be non-oily based?

• A. Oil-based
• B. Water-based
• C. Non-oily based
• D. Alcohol-based

Answer: (C)

During thermolysis, energy must reach the hair follicle through the skin with a consistent, low-impedance contact. An oily topical anesthetic leaves a greasy film that can insulate the surface and increase impedance, making heat delivery to the follicle less efficient and potentially raising the risk of overheating surrounding tissue. Non-oily based anesthetics, such as water-based gels or creams, dry cleanly and don’t form that insulating layer, helping to maintain good electrode contact and predictable heat delivery. They also reduce safety concerns tied to flammability or residue after treatment, which can occur with oil-based or alcohol-containing preparations.