Can electrolysis make blonde hair darker?

Is it possible for electrolysis to make blonde hair darker? A few years ago I decided to try to get rid of my upper lip hair. As it was blonde I had no choice but to go with electrolysis. I had a few treatments which went smoothly but I noticed an unpleasant side effect. After each session some of the hair would grown back darker. According to the technical electrolysis could’t have possible caused this but I noticed no further increase in the amount of dark hair since the last treatment. Can it just be a coincidence?

This is not possible as a result of electrolysis. It’s likely a coincidence, maybe due to a hormonal change or simply getting older. If not, I would suggest that if you were not removing your hair before you started electrolysis sessions, any sun exposure may have lightened the hair slightly. Any new hair that grows in after electrolysis will then be darker due to a lack of sun exposure.

Thank you. That has put my mind at ease.