▶ Previous Artlcle: #15-6. Long-pulsed Alexandrite Laser
For the removal of the congenital melanocytic hairy nevus, there are two effective methods: having lesions repeatedly eliminated by forming crusts from the beginning; and removing the protruding lesions with the Er:YAG Laser and then the remaining thin lesions with the Long-pulsed Alexandrite Laser, like the window technique.
Once lesions are removed to a certain extent, hair removal should be followed.
Since the congenital melanocytic hairy nevus shows a frequent relapse even after complete removal, however, it is necessary to follow up the treated lesions for any recurrence and remove the recurrent lesions again.
.jpg)
[Advertisement] FCR® (Fractional Prickle CoralCalcium Regentron) – Manufacturer: (www.illglobal.com)]
Melasma may be present alone but is often mixed with freckles, lentigo, etc. on the face.
Therefore, melasma treatment requires consideration of treatment for complex pigment lesions.
Melasma is irradiated with the parameters of pulse duration at 2 to 3ms, spot size at 15mm, fluence at 8 to 11J/cm2, and pre & post-cooling.
It should be checked whether a pigment lesion turns pale ash-gray during the 2-pass irradiation.
If there is a fractional hand piece, superficial melasma can be removed effectively and quickly using it.
The oxyhemoglobin absorption coefficients at 755nm and at 1064nm are 3 and 3.2 respectively, which is similar to each other.
Therefore, many different vascular lesions can be treated by setting similar parameters, but the problem is that the melanin absorption coefficient at 755nm is 163, which is a high level.
This is why if parameters are set to treat vascular lesions in the dermal layers and then they are irradiated, pigment lesions in the epidermis will react first, causing problems such as crust formation or burn.
-To be continued.
