True story behind stubborn dark patches that wouldn’t fade — it’s not always the sun

By Justin Maio, PA-C,  Hawaii Premier Dermatology

If you’ve noticed brown or gray-brown patches on your face, chest, or hands, you’re not alone. Dark patches are one of the most common concerns we see at Hawaii Premier Dermatology, and the first question is almost always the same: is this from the sun, or is it hormonal?

The answer matters, because sun spots and melasma can look similar but behave — and respond to treatment — very differently.

📅 Schedule your dermatology appointment today 

What Causes Dark Patches on Skin?

Dark patches, known medically as hyperpigmentation, happen when your skin produces excess melanin, the pigment that gives skin its color. UV exposure is the biggest trigger, but hormones, inflammation, and genetics all play a role too.

Common Types of Dark Patches

Not all dark spots are the same. Here are the forms we see most often:

• Sun spots (solar lentigines): Flat, well-defined tan or brown spots caused by cumulative UV exposure. They typically appear on the face, shoulders, chest, and backs of the hands.
• Melasma: Larger, blotchy patches of brown or gray-brown pigment, usually symmetrical on the cheeks, forehead, upper lip, or jawline. Melasma is driven by hormones — pregnancy, birth control, and hormone therapy are common triggers — and is made significantly worse by sun exposure and even heat.
• Post-inflammatory hyperpigmentation (PIH): Dark marks left behind after acne, bug bites, rashes, or other skin injuries heal.
• Freckles (ephelides): Small, genetic spots that darken with sun exposure and often fade with less of it.

Sun Spot or Hormonal? Quick Ways to Tell

• Pattern: Sun spots are scattered, individual spots. Melasma appears as larger, symmetrical patches — often described as a “mask” across the cheeks and forehead.
• Location: Sun spots show up anywhere the sun hits, including hands and shoulders. Melasma stays mostly on the face.
• Timing: Melasma often appears or worsens with pregnancy or starting hormonal birth control. Sun spots accumulate gradually over years.
• Behavior: Melasma can flare with heat and sun and fade slightly with strict sun avoidance. Sun spots stay fairly constant.

Because early melanoma can sometimes mimic a harmless dark spot, any patch that is changing, has irregular borders, or contains multiple colors should be evaluated by a dermatologist — not self-diagnosed.

OTC Treatments That Actually Work

For mild pigmentation, some over-the-counter ingredients have real science behind them:

• Broad-spectrum sunscreen (SPF 30+): The single most effective step. Tinted mineral sunscreens with zinc oxide or iron oxides also help block visible light, which worsens melasma.
• Vitamin C: An antioxidant that brightens skin and helps block new pigment formation.
• Azelaic acid (10%): Gentle, effective for both melasma and PIH, and safe during pregnancy.
• Niacinamide: Reduces pigment transfer into skin cells and calms inflammation.
• Retinol: Speeds cell turnover to fade spots gradually — introduce slowly to avoid irritation.

That said, OTC products work slowly and often can’t fully clear stubborn pigmentation — especially melasma, which tends to return without a medically supervised plan.

Professional Treatment Options

At Hawaii Premier Dermatology, we tailor treatment to the type of dark patch you have:

• Prescription topicals: Hydroquinone, tretinoin, and combination creams that far outperform OTC strengths
• Chemical peels: Controlled exfoliation to lift pigment safely
• Laser and light-based therapy: Highly effective for sun spots; used cautiously and expertly for melasma, since the wrong laser can make it worse
• Customized maintenance plans: Because with pigmentation, prevention is half the treatment

When to See a Dermatologist

Book an appointment if:

• A dark spot is new, changing, growing, or has irregular borders or colors
• Patches are spreading despite consistent sunscreen use
• OTC products haven’t improved pigmentation after 8–12 weeks
• Dark patches appeared during or after pregnancy or a medication change
• Pigmentation is affecting your confidence — you don’t have to just live with it

Get an Expert Diagnosis Before You Treat

Treating melasma like a sun spot — or vice versa — can waste months and even worsen the problem. A board-certified dermatologist can identify exactly what type of pigmentation you have and build a treatment plan that actually fits it.

📅 Schedule your dermatology appointment today 

This article is for general educational purposes and is not a substitute for individualized medical advice. Please consult a board-certified dermatologist about your specific situation.