Why Do Look Hairier After Laser Hair Removal?

Why Am I Hairier After Laser Hair Removal?

If you’ve noticed more hair growth after starting laser hair removal, you’re not imagining it — but it’s also not the norm. Increasingly, we’re seeing more conversation around a rare phenomenon called paradoxical hypertrichosis, and while it sounds alarming, it’s usually temporary and treatable.

What Is Paradoxical Hypertrichosis?

Paradoxical hypertrichosis (PH) is an unusual response to laser hair removal where instead of reducing hair, the treatment stimulates new growth. This can result in fine, light vellus hairs converting into thicker, darker terminal hairs — often around the edges of the treated area. Although PH can be frustrating, it’s rare. According to a meta-analysis of nearly 10,000 laser hair removal patients, the overall prevalence is about 3% — and it’s even rarer outside of the face and neck. On the body, the odds of developing PH are less than 0.1%. The exact cause isn’t fully understood, but researchers believe it may happen when the laser settings aren’t strong enough to fully disable the follicle. Instead of stopping hair growth, this “subtherapeutic” energy may stimulate the follicle. It’s also more likely to happen in areas with lots of vellus hairs (i.e., peach fuzz or baby hairs) and may be influenced by factors like hormones and skin type.

What Should You Do If You Experience It?

The good news is that, in most cases, paradoxical hypertrichosis improves with continued laser treatments. Studies show that induced hairs often respond to laser in the same way as any other hair — they just need the right settings and a little time. If you’re experiencing unusual hair growth after treatment, don’t panic. Speak with your provider about adjusting your treatment plan. At SEV, our expert nurses and laser technicians are trained to safely adapt each session to your skin and hair needs. With the right care, you’ll be back on track toward lasting smoothness.

Other Reasons for Increased Hair Growth

It’s also important to note that not all post-laser hair growth is true paradoxical hypertrichosis. In some cases, what appears to be new growth is actually hair that was already in a dormant phase during previous sessions. Since laser only targets follicles in the active growth stage, it’s normal for previously inactive hairs to emerge between appointments. Hormonal changes, like those related to PCOS, pregnancy, or certain medications, can also trigger increased hair growth in untreated or partially treated areas. That’s why it’s essential to stay consistent with your treatment plan and communicate any changes with your provider, so they can tailor your sessions accordingly.

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21 Apr, 2025

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