๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
Fractional lasers
Fractional lasers
Fractional photothermolysis (FP) creates an array of microscopic treatment zones via thermal injury to the skin. FP spares tissue surrounding each microscopic thermal wound. In comparison to selective photothermolysis, FP causes tissue damage in microscopic columns that extend into the dermis. The close proximity of uninjured tissue to the microscopic treatment zones allows for shorter migration paths of keratinocytes leading to faster healing. FP spares the stratum corneum, which acts as a natural barrier surrounding the wounds.57 FP is effective in treating a wide range of conditions including acne scars, facial dyschromia, melasma, and granuloma annulare.58
Numerous ablative and nonablative fractional lasers have been produced. Nonablative fractional lasers use focused midinfrared laser micro beams to create microthermal treatment zones. Nonablative fractional lasers generally require multiple
treatments in order to produce results.59 There is no downtime associated with nonablative fractional laser therapy. Ablative fractional lasers use carbon dioxide or erbium lasers to cause destruction in the columnar patterned microthermal treatment zones. Adverse events associated with fractional laser therapy include erythema, edema, and PIH.59
CONCLUSIONS
Many therapeutic approaches are available for the treatment of dyspigmentation. While medical therapy may play a significant role, many patients are eager for an intervention that has a more rapid onset of action and with a less subtle clinical course. Thus, peels and laser and light sources play an important role in dyspigmentation management.60,61 Still, regardless of intervention used, fundamental medical management, including religious photoprotection, is absolutely essential, and even the most complex intervention will fail if the patient does not comply with the fundamentals.