In thermolysis, a shallow needle insertion results in which heating pattern?

• A. Deeper penetration
• B. Faster healing
• C. Less tissue damage
• D. More intense heating pattern

Answer: (D)

In thermolysis, heat generated at the needle tip comes from the tissue’s resistance to the applied current. When the needle is inserted shallowly, the exposed tip is close to the surface, and the current path is short. This concentrates current density in a small, superficial region, so a larger amount of energy is converted to heat in the surface tissues, producing a more intense heating pattern there. If the needle were inserted deeper, the energy would be distributed over a greater depth, spreading heat through deeper tissues and reducing surface intensity. So shallow insertion creates a more intense, localized heating effect in the superficial layers.