What could be the reason behind my hair growing back so fast after 13 sessions of laser removal?

Hello! There are many reasons why laser hair removal can be decreased in effectiveness. Hormonal changes or imbalances, such as those caused by conditions like polycystic ovary syndrome (PCOS), pregnancy, or menopause, can stimulate new hair growth. Hormones play a significant role in hair growth, and fluctuations can result in the appearance of new hair even after laser treatments. I am not sure what color hair you have, but laser hair removal is most effective on dark, coarse hair. Lighter hair colors, such as blonde, red, or grey, and finer hair types are less responsive to laser treatment because they contain less melanin, which is the pigment the laser targets. This can result in some hair being less effectively treated and continuing to grow. Certain medical conditions and medications can also affect hair growth. Conditions like thyroid disorders or the use of certain drugs can stimulate hair growth, counteracting the effects of laser hair removal. I would recommend speaking to your provider about your concerns as well as seeing a provider to evaluate your hormone levels.