Menu guide
- Informing patients
- Beware: hard drug!
- Now or later?
- The hair problem
- Former hair removal methods
- Electrolysis
- Side-effects of the traditional methods.
- Medical laser hair removal
- Choosing the right target
- No options, but the best!
- Laser hair removal indications and contraindications
- Protecting the skin from the heat
- Zoom of laser effect
- Sessions frequency: understanding the hair cycle
- Which laser to choose?
- Technical outlines
- Technical evolution
- Conclusion
Zoom of laser effect
Although everything is done not to damage the skin, patients always present with red spots at the base of each hair after a session. It has even become a clinical sign that guarantees enough energy has been emitted in order to destroy the bulb. These signs are called perifollicular erythema and oedema. Here are a few examples:
We can see on this picture the skin surface of a bikini just after the treatment. All the treated hair have swollen because of the heat they have stored (at 50° to 80°C).
We can see here how removing hair from the bikini area can become a chore, especially on such a broad surface. Indeed, just after the shot, the position of each hair is revealed by rednesses and swellings.
On this first close-up, we have a better view on the surface of the burnt hair, and on the extent of the swellings at the base of the treated bulbs, proving the efficiency of the shot.
In this other patient, the skin literally undulates because of the high number of swollen bulbs. It feels to the touch as if numerous rice grains were underneath the skin.
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The oedema, however big it is, is completely painless and lasts 20 to 40 minutes before it begins reducing. However, rednesses and swellings can last from a few hours to a few days depending on the intensity of the treatment (more dynamic treatments on deeper hair). |
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These close-ups enable to evaluate the efficiency of the laser shot according to the clinical signs obtained, that is the perifollicular erythema and oedema. In spite of these favourable signs and of the power of the alexandrite laser, hair can subsist and new sessions can be necessary! |
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Another relevant clinical sign is hair expulsion. A few micrograms of water evaporate due to the heat generated at the hair base, so that the hair is expulsed as in a peashooter! |
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