Hyperpigmentation on the Face / Cheeks

Clinical Image

Differential Diagnosis of Facial Hyperpigmentation

Melasma - The Most Common Cause on Cheeks

Pathogenesis

• Affects darker skin types preferentially (Fitzpatrick IV-V): East/Southeast/West Asians, Hispanics, Black individuals
• Melasma patients have a lower minimal erythema dose (MED) to UV light and pigment more easily
• Worsens in summer, affects sun-exposed facial skin
• Associated with increased Wnt signaling (stimulates melanogenesis) and solar elastosis in affected skin
• Hormonal triggers: pregnancy (up to 70% of pregnant women), oral contraceptives, hormone replacement therapy, phenytoin, finasteride therapy
• OCP/HRT discontinuation rarely clears it quickly - may persist for years; pregnancy melasma usually clears within months of delivery
• Andrews' Diseases of the Skin, p. 993

Clinical Patterns (Three Types)

1. Centrofacial - forehead, nose, upper lip, chin (most common)
2. Malar - cheeks/nose (most common alongside centrofacial)
3. Mandibular - jawline (least common)

Epidermal vs. Dermal Melasma

• Epidermal melasma: Wood's light accentuates pigment (responds better to treatment)
• Dermal melasma: Wood's light does not enhance it; dermal melanophages present; more treatment-resistant
• Most cases have both components - a therapeutic trial should be offered regardless of Wood's light findings

Post-Inflammatory Hyperpigmentation (PIH)

1. Increased epidermal pigmentation via increased melanocyte activity
2. Dermal melanosis - melanin "dropout" from epidermis into dermis (melanophages in upper dermis)

• More common in Fitzpatrick types IV-VI
• Tends to be tan to brown; gray hue suggests dermal involvement
• Often resolves spontaneously once the triggering inflammation is controlled
• Andrews' Diseases of the Skin, p. 993

Treatment

1. Sun Protection (First and Most Important Step)

• Broad-spectrum UVA/UVB sunscreen (SPF 30+) daily - also blocks visible light, which can worsen melasma
• Sun protection alone modestly improves melasma AND enhances efficacy of bleaching agents

2. Topical Depigmenting Agents

3. Procedural Options (Use with Caution)

• Chemical peels (glycolic acid, salicylic acid, TCA) - mixed evidence; risk of PIH if irritation occurs; recent systematic review (PMID 38530985) supports use in melasma
• Intense pulsed light (IPL) - can improve melasma but high relapse rate; risk of PIH
• Q-switched Nd:YAG laser (1064 nm) - used for melasma but can paradoxically increase pigmentation; low-fluence protocols used
• Fractional CO2 laser - used for refractory PIH with caution
• All laser/light treatments carry higher PIH risk in darker skin types

4. For PIH Specifically

• Treat the underlying cause first (e.g., control acne)
• Hydroquinone for Wood's light-enhancing (epidermal) lesions
• Tretinoin to enhance HQ effect
• Laser/chemical peels must be done with extreme caution in darker patients - results unpredictable

Recent Evidence (2024-2026)

• Chemical peels for melasma [Systematic Review, Sarkar R, 2024 - PMID 38530985]: Supports peels as adjuncts to topical therapy
• Tranexamic acid intradermal injection [Systematic Review + Meta-analysis, Chen LY, 2025 - PMID 39574359]: Effective for adult melasma in RCTs
• Thiamidol (isobutylamido thiazolyl resorcinol) [Systematic Review, Klein PA, 2024 - PMID 39496126]: A newer topical tyrosinase inhibitor showing clinical efficacy for hyperpigmentation
• Solar lentigines treatment [Systematic Review, Mardani G, 2025 - PMID 40145274]: Laser and light treatments effective for solar lentigines specifically

When to Investigate Further

• Diffuse or rapidly progressive pigmentation (rule out Addison's disease - check cortisol, ACTH, electrolytes)
• No obvious sun/hormonal trigger
• Associated systemic symptoms (fatigue, weight loss, GI symptoms)
• Drug history (minocycline, amiodarone, antimalarials, chemotherapy)

Sources: Andrews' Diseases of the Skin (Clinical Dermatology), Fitzpatrick's Dermatology Vol. 1-2, Dermatology 2-Volume Set 5e (Bolognia)

How to Use Hydroquin Plus for Facial Hyperpigmentation

• Hydroquinone 4% - tyrosinase inhibitor (reduces melanin production)
• Tretinoin - retinoid that increases skin cell turnover and enhances HQ penetration
• Mild corticosteroid (e.g., fluocinolone or hydrocortisone) - reduces inflammation and irritation from the other two ingredients

Step-by-Step Application

Nighttime (Only - Do NOT Use in the Morning)

1. Cleanse - Wash face gently with a mild, alcohol-free cleanser using your fingers (no washcloth). Rinse and pat dry.
2. Wait 10 minutes - Let skin fully dry before applying. Damp or moist skin absorbs the cream too quickly and increases irritation risk.
3. Apply the cream - Use a pea-sized/small amount only. Apply sparingly to the hyperpigmented (darker) patches and extend about 1 cm (½ inch) onto the surrounding normal skin. Gently rub in until it becomes nearly invisible. If you can still see white cream, you've used too much.
4. Wash your hands thoroughly after applying - HQ can discolor fingernails and the skin around them.
5. Do not cover with bandages or occlusive dressings unless specifically directed.

Morning Routine (Essential)

1. Wash face gently
2. Apply a moisturizer if needed (dryness is common, especially from tretinoin)
3. Apply broad-spectrum SPF 30+ sunscreen - this step is non-negotiable. Sun exposure undoes the effect of the cream completely. Cover the treated areas from all UV and visible light.

Frequency and Duration

Do not stop abruptly after achieving results - taper gradually (e.g., 3x/week for 2 weeks, then 2x/week for 2 weeks, then stop). Abrupt stopping can cause rebound pigmentation from a "tyrosinase rebound" effect.

What to Avoid

• Do not use in the morning - tretinoin is photosensitized and degrades in sunlight
• Avoid the eye area, nostrils, and mouth - the skin there is too thin and sensitive
• Do not apply to broken, sunburned, or irritated skin
• Avoid harsh astringents, alcohol-based toners, AHAs (glycolic acid), vitamin C serums on treated areas unless already tolerated - combining too many actives increases irritation
• No waxing, electrolysis, or hair removal on treated areas
• Avoid sunbeds entirely during treatment
• If traveling to a very sunny destination, stop the cream 1 week before

When to Expect Results

• Visible improvement takes 4-8 weeks minimum
• Significant results at 2-3 months
• Full effect may take up to 6 months

Side Effects to Watch For

Key Reminders

• Sunscreen every morning is mandatory - without it, the cream will not work
• This cream is not for long-term continuous use due to the steroid component
• Results will be lost without ongoing sun protection, even after stopping the cream
• If no improvement after 3 months, see a dermatologist - may need a peel, laser, or alternative agent

Based on: Andrews' Diseases of the Skin (Clinical Dermatology); Fitzpatrick's Dermatology; Cleveland Clinic & Mayo Clinic drug information for fluocinolone/hydroquinone/tretinoin combination cream

Can Hydroquin Plus Be Used for Dark Circles?

The Short Answer

Why Dark Circles Are Different

Why Hydroquin Plus Specifically Is Risky Around the Eyes

1. Tretinoin is a strong irritant - it commonly causes dryness, peeling, and redness. Under the eye this can cause significant inflammation and paradoxically worsen pigmentation (post-inflammatory hyperpigmentation)
2. Corticosteroid component - long-term use around the eyes is a serious concern. It can cause:
   • Periorbital skin thinning (making dark circles worse long-term)
   • Steroid-induced glaucoma - steroids absorbed near the eye can raise intraocular pressure
   • Cataracts with prolonged use
3. Hydroquinone alone has been used safely in the periocular area, but the full triple combination is too harsh for routine eye area use

The FDA-approved triple combination (HQ 4% / tretinoin 0.05% / fluocinolone) is approved for melasma but its long-term use in the periorbital area is a specific concern due to the steroid component - PMC Periorbital Hyperpigmentation Review

What Actually Works for Periorbital (Under-Eye) Pigmentation

Bottom Line

• Do NOT apply Hydroquin Plus directly under the eyes - the steroid and high-strength tretinoin make it unsafe for the periorbital area
• If your dark circles are brown/pigmentary, see a dermatologist who can prescribe a hydroquinone-only eye-area formulation or guide you on safer alternatives
• If your dark circles are bluish/hollow/structural, Hydroquin Plus will do nothing for them regardless

Can a Face Mask Protect Your Face from Sunlight?

How Fabric Protects from UV

What Makes a Face Mask More or Less Protective?

Better Protection:

• Tightly woven, dense fabric (polyester, nylon, denim) - less UV passes through the tiny gaps in the weave
• Dark or bright colors (black, navy, red) - absorb UV rather than letting it penetrate
• Thicker material - more layers = more blocking
• Dry fabric - wet fabric loses about 50% of its UV protection
• UPF-rated masks - specially tested and certified

Less Protection:

• Loosely woven, thin fabric (sheer cotton, linen, light muslin) - UV rays pass through gaps easily
• Light/white colors - reflect less UV, absorb less
• Stretched fabric - stretching loosens the weave and reduces UPF
• Worn, washed-out fabric - protection decreases over time

Important Limitations of a Face Mask Alone

1. Coverage gaps - the area around eyes, forehead, nose bridge, and temples is often still exposed
2. Visible light - melasma in particular is also triggered by visible light (blue/violet spectrum), not just UV. Most fabric blocks UV well but may let some visible light through
3. Indirect/reflected UV - UV bounces off sand, water, concrete, and snow and can reach skin under a mask from below
4. Fit - if the mask doesn't sit flush against the skin, UV sneaks in at the edges

Best Strategy: Mask + Sunscreen Together

For melasma/hyperpigmentation, dermatologists also recommend tinted sunscreens with iron oxide - these specifically block visible light, which fabric and regular sunscreens often miss. This is especially important when using Hydroquin Plus since sun exposure will directly undo its effect.

Bottom Line

• Yes, a face mask helps - especially a dark, tightly woven or UPF-rated one
• No, it is not enough on its own - sunscreen underneath is still essential, especially when treating hyperpigmentation
• The best sun protection = sunscreen + physical covering + hat + shade
• A simple cotton or surgical mask gives some protection but is not reliable enough to skip sunscreen while you are on active treatment

1. Wash and dry your face, then wait 10 minutes before applying.
2. At night only, apply a small pea-sized amount to dark patches and rub in gently until invisible.
3. Every morning, apply SPF 30+ sunscreen — without it, the cream will not work.
4. Use for up to 3 months, avoid the eye area, and stop if skin becomes darker or very irritated.