Quick answer
Pale patches on the chest, back and neck in a humid climate are usually pityriasis versicolor — a common, treatable yeast overgrowth that is routinely mistaken for vitiligo.
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Shop verified shampoos →What it usually is
Pityriasis versicolor is an overgrowth of *Malassezia*, the same yeast family behind dandruff. It accounts for roughly a quarter of fungal skin cases here, and Bangladesh's heat and humidity are exactly the conditions it thrives in.
1. How it looks
Patches lighter (sometimes darker) than surrounding skin, often on chest, back, shoulders and neck, with a fine scale when scratched. They become most obvious after sun exposure, because the affected skin does not tan.
2. How it differs from vitiligo
Versicolor patches are slightly scaly, off-white rather than stark white, and have indistinct edges. Vitiligo patches are completely depigmented, sharply defined and not scaly. If you are unsure, that is a doctor's question, not a shopping one.
3. What treats it
Antifungal shampoos containing ketoconazole or selenium sulfide, used on the *skin* as a wash — left on several minutes, then rinsed. Extensive or repeatedly returning cases need a doctor and sometimes oral treatment.
4. Why the colour takes longer to return
The yeast is cleared in weeks, but the pigment difference can take months to even out. Treatment working does not look like instant matching skin.
5. Why it comes back
*Malassezia* lives on normal skin. Humidity, sweat and occlusive clothing let it overgrow again, which is why maintenance washes in the hot months help.
Stop doing this
Bleaching creams, steroid creams and skin-lightening products on these patches. Steroids in particular feed the yeast and make it spread.
আরও পড়ুন
Dandruff — the same yeast · sweat and fungal acne
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Antifungal shampoos · body washes