I've noticed freckles/melasma; some days they're very dark, other days they're almost invisible. Why is that?

Why are melasma so "irritable," sometimes darkening, sometimes fading?

If your melasma appears darker on some days, it's not because new pigment is suddenly growing, but rather... "Temporary reaction" It's about the skin's response to stimuli. The doctor will summarize the main causes as follows:

1. Heat and blood vessels (Vascular Factor): Tiny capillaries are often clustered beneath freckles. On days when the patient is exposed to heat. For example, exposure to sunlight, cooking over a stove, or even taking a hot shower causes blood vessels to dilate, pumping more blood to that area. When the already brown discoloration is mixed with the red color of blood, it immediately appears "darker and darker."Yes
   • Here's an example to help you understand: It's like we took... "grey" Apply it on. "White paper" With a pat on "Dark pink paper" Yes, on days when the blood vessels are dilated (pink paper), the freckles will look much more severe than usual.
2. Skin hydration level: On days when patients drink a lot of water, their skin is moisturized and plump. The skin reflects light well (Refractive Index). It makes dark spots appear blurry and faded, but if you're sleep-deprived or your skin is dry, the light will reflect off the pigment and make it more noticeable.
3. Hormones and Stress (Hormonal Fluctuations): When a patient is stressed, their body releases... Cortisol This temporarily stimulates melanin-producing cells to work harder, or even during the period leading up to menstruation, melasma may appear "darker" than usual.
4. Blue light and sunlight (Visual Light & UV): Even at home, prolonged exposure to computer or mobile phone screens emitting blue light can stimulate melanin production in the short term.