Which of the following methods uses a single needle to remove hair from follicles?

The galvanic method is a form of electrolysis that utilizes a single needle to treat individual hair follicles. This method works by applying a direct current through the needle into the hair follicle, chemically altering the follicle’s surrounding tissue to destroy its ability to grow hair. This process typically involves the production of lye, which effectively disables the hair growth mechanism at the root.

In contrast, the multi-needle process uses several needles simultaneously to treat multiple hair follicles, making it a different approach altogether. The thermolysis method also involves the use of a needle but employs high-frequency energy to generate heat, leading to follicle destruction; it is not limited to a single needle, as it can also involve multiple needles. Lastly, the laser method does not employ needles at all; instead, it uses concentrated light to target hair follicles, offering a less invasive treatment compared to electrolysis. Therefore, the galvanic method is uniquely distinguished by its use of a single needle for hair removal.