Finacea Side Effects: What to Expect and When to Call Your Doctor

Starting a new topical medication for rosacea can feel intimidating, especially when the instruction sheet lists a long list of possible side effects. For Finacea (azelaic acid 15%), most patients do experience some initial skin irritation — but it's usually manageable and often improves with time. This guide explains what's normal, what's not, and when you should reach out to your doctor.

Most Common Side Effects of Finacea

The most common side effects of Finacea gel occur at the application site and were reported in clinical trials:

Burning, stinging, or tingling: Reported in approximately 29% of gel users in clinical trials. This is the most common complaint and often improves over the first few weeks of use.

Pruritus (itching): Reported in about 11% of gel users.

Scaling, dry skin, or xerosis: Reported in about 8% of users. Using a gentle, fragrance-free moisturizer after the gel dries can help.

Erythema and irritation at application site: Temporary increase in redness or irritation, especially in the first few weeks.

For the foam formulation, side effects tend to be milder. In clinical trials of the foam, local site pain (burning/stinging) was reported in 6.2% of users, pruritus in 2.5%, dryness in 0.7%, and erythema in 0.7%.

Is the Burning Normal? When Does It Go Away?

Yes — mild to moderate burning and stinging when you first apply Finacea is normal and expected, particularly in the first 1–4 weeks. This is especially common in the first few days. Most patients find that this sensation decreases significantly as the skin adjusts to the medication.

Tips to reduce burning and irritation:

Make sure your skin is completely dry before applying (pat dry after washing — don't apply to damp skin).

Use a gentle, soapless cleanser rather than a foaming or exfoliating wash.

Avoid harsh products like astringents, alcohol-based toners, or abrasive scrubs while on Finacea.

Apply a fragrance-free moisturizer 5–10 minutes after the Finacea has dried to soothe the skin.

Less Common But Important Side Effects

The following side effects are less common but important to be aware of:

Hypopigmentation (skin lightening): Isolated cases of skin lightening have been reported with azelaic acid use. Patients with darker skin tones should be monitored for early signs of uneven lightening. Tell your dermatologist right away if you notice your skin color changing.

Worsening of asthma: Worsening asthma has been reported in postmarketing experience of azelaic acid. If you have asthma and notice increased symptoms while using Finacea, call your doctor.

Exacerbation of cold sores (herpes labialis): Cases of cold sore flares have been reported. If you have a history of cold sores, mention this to your prescriber before starting Finacea.

Serious Side Effects — Stop Using and Seek Care

Rarely, Finacea can cause serious allergic reactions. Stop using Finacea immediately and seek medical attention if you experience:

Swelling of the face, lips, tongue, or throat (angioedema)

Difficulty breathing

Severe skin rash or hives (urticaria)

Severe eye irritation or eye injury after accidental contact

Eye Contact — What to Do

Finacea has been reported to cause eye irritation. If the gel or foam gets in your eyes, flush immediately with large amounts of water. If irritation persists after flushing, contact your doctor or seek urgent care.

Foam-Specific Warning: Flammability

The Finacea foam contains flammable propellants. Avoid open flames, lit candles, cigarettes, or any heat source during and immediately after applying the foam. Do not puncture or incinerate the can.

When to Stop Finacea and Call Your Doctor

Contact your dermatologist if:

Burning, stinging, or itching is severe and doesn't improve after 4 weeks

Your skin is showing signs of lightening or color changes

Your asthma seems to be worsening while using Finacea

Your rosacea is not improving after 12 weeks of consistent twice-daily use — reassessment is recommended

Also see: Finacea Drug Interactions: What to Avoid and What to Tell Your Doctor