Once a vellus hair has been transformed into a terminal hair, how long will it take for it to revert back to vellus?

Once a vellus hair has been transformed into a terminal hair, it typically does not revert back to a vellus hair. Terminal hairs are thicker, coarser, and darker compared to vellus hairs, and their development is often influenced by hormonal changes or external factors. Once the hair successfully changes to the terminal phase, the physiological characteristics of the follicle become altered, making it unlikely to revert to its previous state as a vellus hair.

This information can be crucial for understanding hair growth cycles and the implications for electrolysis treatments, where the goal is to achieve permanent hair removal. Recognizing that terminal hairs are not likely to revert helps practitioners focus on managing the more permanent aspects of hair growth and provides insight into why specific hair types are targeted during electrolysis procedures.