Common Types of Laser Treatments
Medical aesthetic lasers are classified by wavelength and purpose into various types, with different indications. The following is neutral information without efficacy claims.
Lasers are classified by their target (absorption target)
The design principle of medical aesthetic lasers is to have specific wavelengths absorbed by specific 'targets' in the skin, then converted into heat or photoacoustic effects. Therefore, different lasers address different issues, and one machine cannot handle all conditions. Suitability must be assessed by a physician based on skin condition.
- Targeting melanin: mostly for pigmented spots and hair removal
- Targeting hemoglobin: mostly for vascular redness, etc.
- Targeting water: mostly for skin texture and surface renewal (e.g., ablative types)
Difference between ablative and non-ablative lasers
Based on whether the epidermis is removed, lasers can be broadly divided into ablative and non-ablative types. Ablative lasers have stronger effects and relatively more noticeable recovery; non-ablative lasers usually have milder recovery. There is a trade-off between intensity and recovery time, with no absolute superiority. Suitability must be assessed by a physician based on skin condition.
Common laser wavelength ranges (general reference)
Different lasers are designed with different wavelengths corresponding to different tissue penetration depths and absorption targets. The following are general wavelength ranges for common types, for conceptual reference only. Actual model specifications are subject to each instrument's license and physician's explanation:
- Ruby laser: approximately 694 nm, commonly used for superficial pigmentation treatment.
- Alexandrite laser: approximately 755 nm, commonly used for hair removal and some pigmentation treatment.
- Nd:YAG laser: approximately 1064 nm, with deeper penetration, commonly used for deeper pigmentation, vascular, and hair removal.
- Wavelength selection must match skin color, target condition, and instrument indications. The actual treatment plan is evaluated by the physician based on the instrument's licensed purpose and individual skin condition; it is not something consumers can judge on their own.
Why Laser Treatment Usually Requires Multiple Sessions
Most laser treatments do not achieve the goal in a single session; they require multiple treatments with appropriate intervals. Common reasons include:
- Skin tissue metabolism and repair take time. Too short an interval between sessions may increase the risk of side effects. In general, intervals of several weeks or more are arranged; the actual number of days is assessed by the physician based on skin condition and laser type.
- Some conditions (such as pigmentation or vascular lesions) vary in depth or extent, so the effect of a single treatment is limited. Usually, stepwise treatment over multiple sessions is needed to reduce the energy per session and the risk of side effects.
- Hair removal treatments are also affected by the hair growth cycle. Hair follicles in the same area are not all in the growing phase at the same time, so multiple sessions are needed to cover follicles at different stages of the cycle.
- The actual number of sessions and intervals vary depending on the type of treatment, the area, and individual circumstances, and are adjusted by the physician based on treatment response.
Frequently Asked Questions
What are the common types of medical aesthetic lasers?
Common types by purpose include pigment lasers, vascular lasers, ablative lasers, hair removal lasers, and picosecond lasers, with different wavelengths and mechanisms. Suitability should be assessed by a physician.
What should be noted before and after laser treatment?
Generally, it is recommended to enhance sun protection and moisturizing, and follow the physician's care instructions. Actual precautions depend on the treatment and individual skin condition as explained by the physician.
How long is the recovery period for laser treatment?
It varies greatly depending on the laser type and individual condition, ranging from no significant downtime to several days. Please follow the physician's instructions.
Is laser treatment a medical procedure? Does it require a physician?
Yes. Medical aesthetic laser is a medical procedure that must be performed by a qualified physician in a licensed medical facility; the devices are regulated medical devices that must be approved by the TFDA.
Are different lasers suitable for the same issues?
Different. Pigment lasers target spots, vascular lasers target vascular issues, hair removal lasers target hair follicles, ablative lasers improve skin texture, and picosecond lasers are mostly used for pigmentation and some texture issues. Suitability should be assessed by a physician based on skin condition.
Is laser wavelength related to the effect?
Yes. Wavelength affects the degree of absorption and penetration depth of laser for specific tissue targets (e.g., melanin, hemoglobin, water), and is an important basis for instrument design and indications; however, wavelength is only one of many considerations, and actual results are still affected by individual skin condition, machine settings, and operation, requiring overall evaluation by a physician.
How long should the interval be between laser treatment sessions?
The number of days between sessions varies depending on the type of laser, the treatment area, and the individual's skin healing condition. Skin tissue typically requires a recovery period of several weeks or more. The actual schedule is adjusted by the physician based on the treatment response.
Official sources: 醫療器材業務專區（食品藥物管理署）
This page is a neutral compilation of information for reference only; it does not constitute medical advice or any treatment commitment.