Acids

Hydroquinone: Comedogenic Rating & Safety Profile

Also known as: HQ

A potent tyrosinase inhibitor — the most effective ingredient for treating melasma and hyperpigmentation.

Comedogenic

0/5

Safe

0 = won't clog pores · 5 = highly pore-clogging

Irritancy

3/5

Moderate Risk

0 = inert · 5 = often irritating

Function

Acids

Pregnancy

Generally considered safe

Vegan

Typically yes

Also Known As

Quick verdict

Hydroquinone is a acid with a safe comedogenic profile (0/5) and moderate risk irritancy (3/5). A potent tyrosinase inhibitor — the most effective ingredient for treating melasma and hyperpigmentation.

Benefits for skin

Most effective skin-lightening agent
Treats melasma and PIH
Visible results in 4–8 weeks

Best for

Pigmented skin (under guidance)
Melasma

Avoid if

Pregnancy
Breastfeeding
Long-term continuous use
Darker skin tones (without dermatologist supervision)

How to use Hydroquinone safely

Banned OTC in the EU and UK; available 4% by prescription. Use in 3-month cycles followed by 3-month breaks to avoid ochronosis. Always pair with SPF 50+.

Found Hydroquinone in your skincare?

Paste the full ingredient list into our INCI Analyser to see how this ingredient interacts with everything else in the formula.

Frequently asked questions

Is Hydroquinone comedogenic?

Hydroquinone has a comedogenic rating of 0/5 on the dermatologist-developed Fulton scale (0 = no risk, 5 = high risk of clogging pores). This is non-comedogenic and considered safe for acne-prone and oily skin.

Is Hydroquinone safe for sensitive or acne-prone skin?

Hydroquinone has an irritancy rating of 3/5 and a comedogenic rating of 0/5. It is best avoided if you have: Pregnancy, Breastfeeding, Long-term continuous use, Darker skin tones (without dermatologist supervision). It is best suited to: Pigmented skin (under guidance), Melasma.

Can I use Hydroquinone every day?

Hydroquinone has a higher irritancy profile (3/5). Start 2–3 times per week and only increase frequency if your skin tolerates it well. Banned OTC in the EU and UK; available 4% by prescription. Use in 3-month cycles followed by 3-month breaks to avoid ochronosis. Always pair with SPF 50+.

Who should avoid Hydroquinone?

Avoid Hydroquinone if you have any of the following: Pregnancy, Breastfeeding, Long-term continuous use, Darker skin tones (without dermatologist supervision).

What is the comedogenic scale?

The 0–5 comedogenic scale was developed by dermatologists Dr. James Fulton and Dr. Albert Kligman. 0 = no risk; 1–2 = low; 3 = moderate; 4–5 = high. See the full pore-clogging ingredients guide for the complete list and methodology.

Other acids to know

Retinol

A Vitamin A derivative that accelerates cell turnover, boosts collagen and is the gold-standard ingredient for reducing wrinkles and acne.

Salicylic Acid

An oil-soluble exfoliant that penetrates into pores to dissolve sebum, dead skin and the plugs that cause blackheads and acne.

Glycolic Acid

The smallest AHA molecule, derived from sugarcane. It exfoliates the surface of the skin to reveal smoother, brighter, more even-toned skin.

Benzoyl Peroxide

An over-the-counter antibacterial that kills C. acnes bacteria and reduces inflammation. Often the first-line treatment for inflammatory acne.

Want the full picture on pore-clogging ingredients? Read our complete guide to comedogenic ingredients for the dermatology research behind the 0–5 scale and the full list of high-risk ingredients to avoid.

Written by ScanSkinAI Cosmetic Science Team · Last updated June 2026

This information is for educational purposes only. Always patch-test new products and consult a dermatologist if you have specific skin concerns.