Laser, IPL, or Cryotherapy for Age Spots: How the Three Main In-Office Options Actually Differ

Solar lentigines, the flat brown patches most people call age spots, are collections of excess melanin sitting in the lower epidermis, produced by melanocytes that have been chronically stimulated by ultraviolet exposure. Because the pigment lives in living skin tissue rather than on the surface, no scrub or wash removes it. The three treatments dermatologists reach for most often, pigment-targeting lasers, intense pulsed light, and cryotherapy, all destroy or disperse that pigment, but they do it in mechanically different ways. Those differences matter for results, downtime, and complication risk.

How pigment-targeting lasers work. Q-switched and picosecond lasers deliver extremely short pulses of light at wavelengths melanin absorbs strongly, typically 532, 694, 755, or 1064 nanometers. The pulse is shorter than the time it takes heat to leak out of a melanosome, a principle called selective photothermolysis. The pigment granule absorbs the energy, shatters or superheats, and the surrounding skin is largely spared. Clinically, a treated lentigo darkens within minutes, forms a thin crust over several days, and flakes off within one to two weeks, usually revealing lighter skin underneath. Many lentigines clear substantially after one to two sessions, which is faster than the alternatives.

How intense pulsed light works. IPL is not a laser. It is a broadband flash lamp emitting a range of wavelengths, usually filtered to roughly 500 to 1200 nanometers. Melanin still absorbs the energy, but the pulses are longer and less selective, so the heating is gentler and more diffuse. Treated spots typically darken to a coffee-ground appearance and shed over one to two weeks with little to no crusting. IPL usually requires two to four sessions for comparable clearance, but it covers large areas quickly, which makes it practical for diffuse sun damage across the cheeks, chest, or backs of the hands rather than a handful of discrete spots. Because IPL also targets hemoglobin, it can simultaneously reduce the redness that often accompanies photoaged skin.

How cryotherapy works. Liquid nitrogen applied for a few seconds freezes the lesion. Melanocytes are more sensitive to cold injury than surrounding keratinocytes, dying at roughly minus 4 to minus 7 degrees Celsius, temperatures other skin cells can survive. The freeze destroys the pigment-producing cells, the spot blisters or crusts, and it heals over one to three weeks. Cryotherapy is fast, inexpensive, and widely available, but it is the least selective of the three. Overfreezing can destroy melanocytes permanently, leaving a white mark, and underfreezing leaves pigment behind.

Skin tone changes the calculation more than anything else. All three methods carry a risk of post-inflammatory hyperpigmentation, meaning the treated area heals darker than it started, and that risk climbs steeply in medium to deep skin tones, roughly Fitzpatrick types IV to VI. The reason is mechanistic: in darker skin, the normal epidermis contains enough melanin to absorb treatment energy itself, so the injury is less confined to the lesion, and melanocytes in darker skin respond to inflammation with more vigorous pigment production. Cryotherapy in darker skin also carries meaningful risk of permanent hypopigmentation, a pale spot that can be more noticeable than the original lentigo. For deeper skin tones, clinicians often favor longer-wavelength lasers such as 1064 nanometer devices at conservative settings, low-fluence approaches, or topical regimens, and they frequently pretreat with pigment-suppressing agents to lower rebound risk. IPL is generally avoided in the darkest skin types.

What the comparative evidence suggests. Head-to-head studies are limited but reasonably consistent. Q-switched and picosecond lasers tend to produce the highest single-session clearance rates for discrete lentigines, often in the range of 50 to 90 percent improvement after one to two treatments in lighter skin. IPL achieves similar endpoints over more sessions with milder downtime per visit. Cryotherapy performs respectably in trials on light skin, sometimes matching laser clearance, but with higher rates of pigmentary complications. No modality changes the underlying biology: the melanocytes that remain are still sun-responsive, so spots recur or new ones appear without daily broad-spectrum sunscreen. Recurrence within a year or two is common when photoprotection lapses.

One caution that outranks all of the above. Any brown spot slated for removal should be evaluated first, because lentigo maligna, an early melanoma, can closely mimic a benign age spot, especially on the face of older adults. Treating a melanoma with a laser or freezing it does not cure it; it hides it. A clinician should examine any lesion that is new, changing, irregular in border or color, or simply uncertain, ideally with dermoscopy, before any cosmetic destruction. Once a spot is confirmed benign, the choice among laser, IPL, and cryotherapy comes down to skin tone, how many spots need treating, tolerance for downtime, and budget, decided in that order.