Which of the following techniques is not commonly used for reducing cellulite?

Hot stone massage is not commonly used for reducing cellulite because its primary purpose is relaxation and muscle tension relief rather than targeting skin texture and fat deposits, which are the typical concerns associated with cellulite. While hot stone massage may improve circulation and promote an overall sense of well-being, it lacks the specific mechanisms needed to effectively address the underlying causes of cellulite.

In contrast, microdermabrasion, mesotherapy, and chemical peels are techniques focused on skin texture improvement and can help reduce the appearance of cellulite. Microdermabrasion works by exfoliating the outer layer of the skin, which can enhance the skin's appearance. Mesotherapy involves injecting substances that can break down fat deposits and improve skin texture. Chemical peels utilize acids to slough off dead skin cells and promote new skin growth, which can also improve the appearance of cellulite.

Thus, the reason hot stone massage is the correct response lies in its lack of direct efficacy in treating the specific characteristics of cellulite compared to the other techniques.