Lasers are powerful and finely focused beams of light. There are lasers which are little more than thin torches—such as the pointer beams used by lecturers—which operators claim can stimulate wound healing, help hair growth and so on. Beware of these! In general there is no proof that they do what they are claimed to do although you will almost certainly waste your money in discovering this. Most medical lasers are extremely expensive pieces of equipment so that few doctors have one in their surgery. Some people expect them to perform miracles such as eradicating skin spots without leaving any mark at all or even removing scars completely. They are certainly very useful machines but they do have limitations!
A laser operator should have a certificate of proof of training. Most work in groups in order to share the cost of the equipment or else are dealing so often in cosmetic work that owning one becomes cost-effective.
The way each laser works depends on the wavelength, or color, of the light which it emits. Light from yellow lasers for instance is taken up by red blood cells, and helps remove red marks. Green light lasers help brown marks, and long wavelength light lasers burn up tissue so they can be used as scalpels which seal the blood vessels as they cut.
There are different lasers for different jobs—there is no single magic wand.
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