KTP Laser to Remove Brown Spots?

KTP lasers utilize laser energy at 532nm, which is coherent green light. (KTP stands for Postassium--chemical symbol K, T stands for titanyl, and P for phosphate: the potassium titanyl phosphate crystal is  used to double the frequency (halving the wavelength) of a Nd-YAG 1064nm near-infrared laser).

At this green wavelength of 532nm, there is pretty good absorption of the laser energy by two things present in skin, hemoglobin and melanin, the skin suntan pigment. The rest of the skin doesn't absorb this wavelength of laser energy well, so when you have either tiny superficial blood vessels you want to eliminate, or brown spots (sun spots, freckles, keratoses--not moles or skin cancers) that you want removed or lightened, this is an excellent choice.

Your doctor is giving you good advice. Listen to him. Online research should supplement, not replace, consultation with experienced, board-certified physicians that you trust. If your doctor won't take the time to answer good questions, find another who will.

Fractional laser is an amazing and highly effective treatment in our office. We use the laser treatment to help with acne scars, large pores, fine wrinkles, tissue collagen loss, scars, sebaceous hyperplasia, active acne, and for brightening dark pigmentation. Although there are very strong fractional lasers such as CO2 laser, we use lighter treatments for corrective skincare and maintenance of results. Our Thulium fractional laser, clear and brilliant laser, and Ultra Thulium laser are excellent options in our clinic. We also perform CO2 fractional and erbium depending on skin tone and tolerance for downtime. Patients do have to use a Melarase cream before and after treatment to help further reduce pigmentation after laser. Melarase AM, Melarase PM, and Melapads can seriously improve surface sun damage and UV related pigmentation. Dark spots can improve with these treatments. I recommend fractional laser for incisional scars as well, especially after plastic surgery.
Best,
Dr. Karamanoukian
Realself100 Surgeon

A  KTP (532nm) laser can be used to treat pigmented lesions.

The ideal treatment for "brown spots" varies depending on the details of the spot.  This can be determined by your physician when he/she examines you prior to treatment.  If there is any question as to whether a pigmented lesion is benign then it should be biopsied prior to starting treatment.