Laser hair removal: what are the possible risks and side effects?

The side effects of laser hair removal are usually mild and temporary: redness and slight swelling around the hairs, which generally disappear within 48 hours. Complications such as burns or pigmentation marks are rare when the skin has been properly assessed and the instructions are followed. At the Centre Laser Valbonne, the free preliminary consultation with Dr Milène VERA identifies at-risk situations before treatment begins, and she personally manages any complications.

What are the normal reactions after a session?

Just after the session, the skin is often red, with slight swelling around each hair and a feeling of warmth comparable to mild sunburn. These reactions are normal and usually fade within 48 hours. A soothing cream is recommended after each session. In the following days, the hairs sometimes seem to keep growing: these are in fact the treated hairs being pushed out. They fall out on their own and should not be pulled.

Which side effects are possible but rarer?

Small scabs or small blisters may occasionally appear, or the skin may darken temporarily (hyperpigmentation). These reactions occur mainly on tanned or irritated skin, or when a contraindication has not been reported. For people at risk of brown marks, a cortisone-based cream for the 2 days after the session may be prescribed. Light patches (hypopigmentation) are rarer and usually temporary: they fade within a few months. Another possible effect, on the face (cheeks, under the chin) and on the shoulders in men, is paradoxical hair growth, where fine hairs are stimulated instead of destroyed. This risk is assessed at the consultation. If you notice an unusual reaction, contact the centre through Doctolib messaging.

Is there a risk of burns?

The risk exists, but it remains low. During the session, a stream of cold air protects the surface of the skin. The risk increases mainly on skin recently exposed to the sun, with an unreported photosensitising medicine, or if the settings are not suited to the skin. That is why the consultation looks for these situations, and why Dr VERA sets the laser herself at the first session.

How can the risks be reduced?

The rules are simple: no sun exposure in the two weeks before each session, SPF 50 sunscreen on the treated areas throughout the treatment course, no wax, tweezers or epilator, no irritating products on the area around sessions, and report any new medicine. Following these instructions is the best protection against complications.

Is laser hair removal safe in the long term?

Yes. Practised for several decades, laser hair removal has shown no harmful long-term effect on the skin when properly performed. The laser acts only at the surface, on the hair follicles: it does not reach organs or deep tissues.

Frequently asked questions

How long does redness last after a session? Usually less than 48 hours, sometimes only a few hours. A soothing cream, and avoiding hot baths, saunas and steam rooms for 48 hours, help the skin recover.

Can the laser leave scars? Very rarely. The main risk concerns tattoos: the laser can burn the ink and leave a scar. That is why tattoos are never treated, and a safe distance is always kept during the session. Otherwise, a scar can only follow a burn, which is exceptional when contraindications and instructions are respected.

Should I avoid exercise after a session? Avoid intense exercise on the day itself, and heat (hot baths, saunas, steam rooms) for 48 hours: sweat and heat can irritate the treated skin.

Can you be allergic to the laser? No, the laser itself does not cause allergies. A reaction to a cream applied before or after the session remains possible: mention any allergies during the consultation.

Free and compulsory preliminary consultation — booking via Doctolib. Book an appointment on Doctolib