Question 1

What causes pigment to recur?

Accepted Answer

The core reason pigment recurs is that treatment only lightens the melanin pigment, but the cells that produce melanin (melanocytes) remain. When the stimulus is removed, the cells can become active again and produce pigment. In particular, melasma is a condition with a strong tendency to recur fundamentally. Even if it lightens with treatment, it can darken again if triggering factors persist. Representative triggers that cause recurrence include UV rays, heat, hormonal changes (pregnancy, birth control pills), and physical friction. In actual laser toning studies, rebound hyperpigmentation (where pigment becomes darker after treatment) and melasma recurrence have been reported in some patients. This can occur when excessive energy or frequent treatments stimulate melanocytes. In other words, receiving treatment "strongly and often" is not always the answer. Therefore, brightening treatment is not a one-time event. Improvement is maintained only when treatments that lighten pigment are combined with lifestyle and home care that do not reactivate the cells. That is why at Heal House, along with treatments that lighten pigment, we also examine the skin barrier and plan around low-irritation toning tailored to the individual's pigment condition.

Question 2

Can improper home care make hyperpigmentation persist?

Accepted Answer

Yes, improper home care can actually make pigment persist. In particular, strong friction, excessive exfoliation, and overuse of unverified brightening products can cause micro-inflammation in the skin, leading to post-inflammatory hyperpigmentation (PIH). This creates a vicious cycle where the pigment you were trying to improve becomes darker due to irritation. Representative bad habits include picking at acne or scabs, scrubbing roughly with a scrub or towel, and applying high-concentration acid products daily based on your own judgment. Because the skin's inflammatory state and the stability of melanocytes determine the intensity of hyperpigmentation, reducing irritation itself is already half of pigment management. The basics of proper home care are gentle cleansing, maintaining the barrier with sufficient moisturizing, and sun protection. Even when using brightening functional ingredients (such as vitamin C or niacinamide), if the skin becomes red or stings, it is safe to stop use and consult a specialist.

Question 3

Why is Asian skin more sensitive?

Accepted Answer

Asian skin tends to be more prone to hyperpigmentation and rebound pigmentation because many individuals have a skin type (Fitzpatrick type III–IV) in which melanocytes react sensitively to stimuli. Even with the same intensity of treatment or irritation, pigment reactions can be more pronounced than in Caucasians.

Skin type characteristics	Pigment reaction tendency
Light skin (Fitzpatrick type I–II)	Risk of erythema and burns is relatively more dominant than hyperpigmentation
Most Asians (Fitzpatrick type III–IV)	Higher tendency for post-inflammatory hyperpigmentation (PIH) and rebound pigmentation
Dark skin (Fitzpatrick type IV–V)	Highest risk of laser-induced pigment changes, requiring a cautious approach

For this reason, in Asian skin, a method of dividing treatment into multiple sessions with low energy rather than a "strong single shot" is known to be more favorable for reducing pigment burden. Designing treatment intensity and intervals according to skin type is key to reducing recurrence and side effects. Since the appropriate approach varies by individual skin tone and pigment depth, a specialist's judgment is important.

Question 4

How do you manage to prevent pigment recurrence?

Accepted Answer

The core of management to prevent recurrence is consistently maintaining three pillars: 'minimizing irritation + maintenance care + blocking triggering factors.' After treatment lightens the pigment, lifestyle habits and home care must be managed so that melanocytes are not reactivated, for the improvement to last. Specifically, first, practice thorough sun protection every day; second, keep the skin barrier strong to reduce micro-inflammation; and third, continue low-irritation maintenance care at set intervals. If you stop care when the pigment lightens, it can gradually return as long as triggering factors remain. Booster-type treatments like REJURAN®, which improve both the skin and the barrier, can help with skin stabilization, and whether to use them depends on the pigment condition. Above all, avoid overusing strong products based on your own judgment or receiving treatments in quick succession, as this can actually cause rebound hyperpigmentation. In clinical practice, periodically checking the skin condition and adjusting treatment intensity and intervals is a major part of recurrence management.

Question 5

How thorough should sun protection be?

Accepted Answer

Sun protection is the most fundamental habit in post-treatment care after brightening procedures, and it should be done every day, even indoors and on cloudy days. UV rays are a representative trigger that directly stimulates melanocytes, so if you neglect protection, pigment can darken again no matter what treatment you receive. Practically, it is recommended to apply a product with SPF 30 or higher and PA+++ or higher in a sufficient amount in the morning, and reapply every 3 hours if outdoor activity is prolonged. In strong sunlight where sunscreen alone is insufficient, combining physical barriers such as a hat, parasol, and sunglasses is effective. Especially right after treatment, the skin is sensitive, so it is advisable to be even more thorough with protection. In summary, it is no exaggeration to say that the success of brightening treatment is determined not in the treatment room but in the daily sun protection after treatment. If pigment recurs repeatedly, it is recommended to first check your sun protection habits and home care, and then redesign your treatment and care plan with a specialist.