Vitiligo and Skin Trauma in Facial Harmonization Procedures

Vitiligo is a disease that affects skin pigmentation, and one of its most discussed aspects in the aesthetics clinic is the Koebner phenomenon, or isomorphism: the appearance of new lesions in areas that suffered trauma. For HOF professionals, who perform an invasive procedure, the reasoning is natural and important: the needle, the cannula, pressure and the inflammatory process are all forms of trauma. The risk is not universal, but it exists, and the patient has the right to know about it.

This page is a clinical reasoning guide at review level. It does not replace dermatological assessment or each service's protocols, which are at the discretion of the qualified professional and in line with the rules of their professional board.

What is the Koebner phenomenon?

The Koebner phenomenon describes the occurrence of typical lesions of a skin disease in previously normal areas that received a stimulus, such as mechanical trauma, friction, a burn, a scar or inflammation. It is well described in dermatoses such as psoriasis, lichen planus and vitiligo. In vitiligo, it can show up as areas of depigmentation at sites of cuts, rubbing, scratches or procedures.

The exact mechanisms are not fully understood. Hypotheses include oxidative stress, local immune response and changes in the melanocyte microenvironment after trauma. It is not possible to predict in which patient it will happen, but there are situations in which susceptibility seems higher.

To understand the pigmentation context, see hypopigmentation and infraorbital hyperpigmentation after a procedure.

Which patients deserve more attention?

Some elements increase the need for caution:

• Active disease: new or expanding lesions in recent months.
• History of Koebner: the patient reports lesions that appeared on scars, burns or areas of friction.
• Extensive or generalized vitiligo: greater disease burden and possibly greater susceptibility.
• Lesions on the face, lips or around the mouth: the aesthetic and emotional impact is large.
• Family history of associated autoimmune diseases.
• Concomitant autoimmune diseases, such as thyroid disease, which deserve joint assessment.

Even in disease considered stable, the risk does not go away. Stability is an indicator of lower activity, and the dermatologist is usually the best person to define it.

Which HOF procedures involve relevant trauma?

Any procedure that breaks the skin or causes inflammation can, in theory, act as a trigger. This includes, to different degrees:

• Injections of toxin, fillers and biostimulators.
• Microneedling and skin boosters.
• Thread lifts, which involve punctures and insertion of material.
• Peels and technologies that cause controlled injury, such as lasers and radiofrequency.
• Procedures that cause significant bruising or swelling.

The intensity of the trauma and the area influence the risk, but there are no data that allow a safe scale to be defined. That is why the reasoning is individualized: does the expected benefit justify the risk? Is there a less invasive alternative? Does the patient understand and accept?

How do you assess the patient at the consultation?

A targeted medical history helps. Besides the general history, ask about vitiligo specifically:

1. How long has the disease been present and how is it distributed?
2. Have there been new lesions or expansion in recent months?
3. Have lesions ever appeared at sites of cuts, burns, scars or friction?
4. Is the patient under dermatological care? What treatment are they using?
5. Are there other autoimmune diseases, such as thyroid disease?
6. Has the patient had aesthetic procedures before? Did any lesion appear afterward?

The findings guide the decision. A patient with active disease and a history of Koebner has an apparently higher risk, and the usual recommendation is caution, perhaps postponing the procedure until greater stability or, in some cases, advising against it. A patient with long-standing stable disease and no known Koebner can be considered carefully, after a conversation and coordination with the dermatologist.

For the history-taking routine, see medical history in HOF and autoimmune diseases and fillers.

What should the consent say?

The consent should record that the patient was informed about the Koebner phenomenon, understands that there is no way to predict whether it will occur and accepts the risk. It should also state that new lesions, if they appear, may need dermatological follow-up and are not necessarily reversible. It is important that the patient takes part in the decision, without pressure, and has time to think.

A pre-procedure photograph is useful, including as documentation of the skin's condition. Follow the rules in consent and LGPD for photos (LGPD is Brazil's data protection law).

How do you handle the lips and face?

On the lips and around the mouth, vitiligo can be especially relevant because of the aesthetic impact, and the thin skin of the area has its own characteristics. Patients with perioral lesions may seek lip filler for various reasons, and the decision calls for extra attention. See lip filler for the procedure in general, remembering that it carries its own risks, including vascular occlusion, and that hyaluronidase must be available when hyaluronic acid is used.

On skin that is already depigmented, the visual result of bruising, swelling and scars may be different, and sun protection is even more important. Sun protection advice should be reinforced, and the patient should know that how the disease evolves depends on many factors besides the procedure.

What about hypopigmentation from other causes?

Not every light patch after a procedure is vitiligo. Scars, dermatitis, post-inflammatory hypopigmentation, use of substances and other conditions can cause patches. When the diagnosis is in doubt, dermatological assessment is the way to go. To tell them apart, see hypopigmentation, post-inflammatory hyperpigmentation and contact dermatitis.

How do you follow up the patient?

Follow-up should be closer than usual. Schedule return visits, ask the patient to report any new patch and compare with the pre-procedure photos. Record observations in the patient record. For a patient with active disease who insists on a procedure, the plan may include localized tests and longer intervals, but such strategies do not remove the risk and lack robust evidence.

Documentation

Record the disease, its activity, the history of Koebner, the conversation with the dermatologist (if there was one), consent, prior photos, the procedure performed and the follow-up plan. This record protects patient and professional and makes it possible to track the outcome. Also review patient record and documentation in HOF.