Paradoxical hypertrichosis refers to which phenomenon?

• A. Stimulation of hair growth in expected areas
• B. Cessation of hair growth
• C. Uniform hair color change
• D. Stimulation of hair growth in unintended areas

Answer: (D)

Paradoxical hypertrichosis means that a hair-reduction treatment ends up stimulating hair growth in areas outside the treated zone. It’s the opposite of what the procedure aims to achieve, so it’s described as paradoxical. This phenomenon can occur after laser or light-based hair removal and may be linked to treatment parameters (such as high energy or insufficient cooling), skin reactions, or hormonal factors that spur follicles in unintended areas to enter the growth phase. When this happens, clinicians reassess settings and may adjust or pause treatment in those regions, while also considering any hormonal contributors.