Laser Hair Removal questions

It is a permanent reduction, not permanent removal. FDA clearances define permanent hair reduction as a long-term, stable drop in regrowing hairs at 6, 9 and 12 months after the treatment course. ASPS says it does not guarantee permanent removal and maintenance may be needed.[1][2][3]

The AAD says most patients need 2 to 6 treatments, 4 to 6 weeks apart. ASPS says most people need 4 to 6 sessions. The first treatment reduces hair about 10% to 25%.[1][2]

Only follicles in the growth phase (anagen) respond. In a 1998 study, catagen and telogen follicles resisted laser pulses. Each session reaches the follicles that are growing at that time.[1][2]

The long-pulsed 1064 nm Nd:YAG. A 2013 review calls it the best laser for pigmented skin. In 20 women with skin types IV to VI it gave 70% to 90% reduction at 12 months. Long-pulse diode and alexandrite lasers have also been used in skin types IV to VI. A 2026 review advises against IPL in these skin types.[1][2][3]

Poorly. The light targets melanin, so dark hair responds best. A 2002 review names light-colored hair as the remaining challenge.[1][2][3]

A laser emits one wavelength. IPL is a filtered flashlamp with a broad spectrum, about 590 to 1200 nm. A Cochrane review found about 50% short-term reduction with alexandrite and diode lasers and little randomized evidence for IPL.[1][2][3]

Faster. In a split-armpit trial, alexandrite laser cleared 74% of hair at 6 months against 35% for electrolysis and was 60 times faster. Before lasers, electrolysis was the only method that offered permanent removal, but it treats one hair at a time.[1][2][3]

In the short term. A 2012 systematic review found hair reduction of 6% to 72% with home devices, from studies with no randomized trials. In a 2015 trial, an 810 nm home laser cut growing hair up to 59%, but hair returned when use stopped.[1][2][3]

Patients describe the pulses as warm pinpricks or a snapped rubber band. The FDA warns against over-the-counter numbing products with more than 4% lidocaine, heavy use over large areas and covering treated skin, because of heart rhythm problems and seizures.[1][2]

Physicians (MD and DO) may perform it. A 2019 Florida House staff analysis states that physician assistants and advanced practice nurses may perform it under physician supervision. Electrologists may use FDA-cleared devices only after required training and certification, under the direct supervision of a trained physician, on site or by telehealth within 150 miles, under Rule 64B8-56.002. A physician may supervise no more than 4 electrologists.[1][2][3]