Hydroquinone during Sun Exposure
Hydroquinone use requires strict SPF — rebound pigmentation is the failure mode; ochronosis is the long-term one.
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go slower than usual.
Hydroquinone use requires strict SPF — rebound pigmentation is the failure mode; ochronosis is the long-term one.
how to use it. SPF 30+ mineral daily throughout the treatment cycle and afterward. Cycle usage (3 months on, 3 months off) to prevent ochronosis. Do not stop abruptly — taper gradually to avoid rebound.
why it works. The lightening effect is undermined and can reverse dramatically under UV. Prolonged use above 4% or chronic uncontrolled use risks exogenous ochronosis — a 2025 BJD paper reframes the mechanism as tyrosinase-catalysed hydroquinone metabolism producing dermal ochronotic pigment. Mineral SPF is prefe...
Reviewed with 3 sources on 2026-07-03.
Glycolic Acid (AHA) during Sun Exposure
Glycolic acid is photosensitizing — SPF is non-negotiable. FDA mandates a Sunburn Alert on AHA products.
also about sun exposureL-Ascorbic Acid (Vitamin C) during Sun Exposure
L-ascorbic acid is beneficial before sun exposure — it enhances SPF antioxidant defense.
also about sun exposureRetinoids during Sun Exposure
Retinoids increase photosensitivity — pair with mandatory SPF and prefer PM use.
also about sun exposureSalicylic Acid (BHA) during Sun Exposure
Salicylic acid is mildly photosensitizing — SPF is non-optional the next day.
also about hydroquinoneHydroquinone around Laser Resurfacing
Hydroquinone pre-treatment reduces PIH risk in Fitzpatrick IV-VI receiving laser resurfacing.
also about hydroquinoneHydroquinone during Breastfeeding
Continue to avoid hydroquinone during breastfeeding.