Photoacoustic Effect
The photoacoustic effect in the field of medical aesthetics refers to the phenomenon where light energy, after being absorbed, is transformed into mechanical waves (sound waves). When specific substances (such as skin tissue, pigments, etc.) absorb light energy, this energy is converted into thermal energy, causing rapid local heating and thermal expansion, which in turn generates pressure waves or sound waves. This effect is typically triggered by nanosecond or picosecond-level short-pulse lasers because, at this timescale, thermal diffusion effects can be neglected, and the energy is concentrated locally.
Photothermal Effect
In contrast, photothermal effect focuses on the direct conversion of light energy into thermal energy for heating target tissues. This effect can be used for heating deep tissues, as applied in radiofrequency and laser aesthetics to achieve therapeutic purposes. The timescale of the photothermal effect can be longer compared to the extremely short duration of the photoacoustic effect (nanoseconds/picosecond), allowing for different treatment effects in medical aesthetics.
Photoacoustic Effect Machines
Photothermal Effect Machines
Tips on Possible Scab Formation After Photoacoustic Treatment
In the medical aesthetics field using photoacoustic effects, some post-treatment reactions such as scab formation may occur. Here are some possible reasons and suggestions:
- Why do scabs form? After laser treatment, the skin may experience minor damage due to localized thermal effects, leading to the formation of protective scabs on the skin surface. This is usually part of the normal healing process.
- How long is scab normal to last? Scabs typically fall off naturally within 7-10 días. If the pigmentation is deeper or the treatment intensity is higher, the scab time may extend to 2-3 semanas.
- How to determine if the scab is abnormal?
- Normal reaction: The scab has no redness, pain, or pus, and the skin is smooth after it falls off, possibly with slight pigmentation.
- Abnormal reaction: Persistent redness, pain, or infection, depressed scars or deep pigmentation after the scab falls off, the scab has not fallen off after two weeks or is worsening.
- How to promote healing and reduce sequelae?
- Keep the wound dry, avoid water contact, and prevent infection.
- Use high SPF sunscreen to prevent pigmentation caused by UV stimulation.
- Use gentle moisturizing repair products after the scab falls off to promote skin healing.
- Avoid using irritating products to reduce the risk of post-inflammatory pigmentation.
- Regularly observe, if the scab persists for more than 3 weeks without falling off or shows signs of infection, seek medical attention as soon as possible.
