The beauty treatments studied as interventions included manicures, pedicures, make-up sessions, depilation, hairdressing, and massages. Researchers studied the effect of beauty treatments on depression.

Quintard, B., & Lakdja, F. (2008). Assessing the effect of beauty treatments on psychological distress, body image, and coping: A longitudinal study of patients undergoing surgical procedures for breast cancer. Psycho-Oncology, 17, 1032–1038. doi:10.1002/pon.1321