The Bottom Line

Infantile acne is acne that persists past 3 to 4 months of age or starts after that point. Unlike the common newborn acne that clears on its own, infantile acne is often a sign that your baby's body is producing too many hormones. It requires an evaluation by both a dermatologist and a pediatric hormone specialist (endocrinologist). The underlying condition is usually treatable, and most babies see the acne improve once hormone levels are brought back to normal.

What Is Infantile Acne?

It is normal for newborns to develop mild acne in the first few weeks of life — this is called neonatal acne and it goes away on its own. Infantile acne is different. It refers to acne that either:

  • Starts after 3 to 4 months of age, or
  • Was present at birth or shortly after but does not clear up by 3 to 4 months

Infantile acne is uncommon — it affects about 1 to 2% of infants compared to 20 to 40% who get the harmless newborn variety. When a baby has infantile acne, it usually means their own body is making too many androgens (male-type hormones), not leftover hormones from the mother.

Signs and Symptoms

Infantile acne tends to look more like teenage acne than newborn acne:

  • Red bumps (papules) and pus-filled pimples (pustules) on the face, chest, or back
  • Occasionally larger, deeper nodules
  • Acne that worsens over time instead of fading
  • May also see signs of excess hormones: rapid growth, early pubic or underarm hair, or — in girls — signs of virilization

Unlike neonatal acne, which is mostly blackheads and whiteheads, infantile acne has a significant inflammatory component and can leave scars if not treated.

What Causes Infantile Acne?

Infantile acne is caused by the baby's own hormone system — not the mother's hormones. Elevated androgens from the adrenal glands or other sources stimulate oil glands and trigger acne. The most common underlying cause is congenital adrenal hyperplasia (CAH), found in about 10 to 15% of cases. CAH is a genetic condition where the adrenal glands overproduce androgens. Other causes include benign adrenal tumors (about 5% of cases) and idiopathic androgen excess where no specific cause is found but hormone levels are still elevated.

Treatment Options

Step 1 — Endocrinology evaluation: The most important first step is a referral to a pediatric endocrinologist. They will run blood tests to measure hormone levels, possibly do an ACTH stimulation test, and may order an ultrasound to look at the adrenal glands. Finding and treating the root cause is what resolves the acne long-term.

Treating congenital adrenal hyperplasia (CAH): The most common cause of infantile acne — CAH — is treated with low doses of hydrocortisone, which rebalances the hormones. Most babies see 80 to 90% improvement in their acne within 4 to 8 weeks of starting treatment.

Treating adrenal tumors: If an adrenal adenoma is found, surgery (laparoscopic removal) typically normalizes hormone levels quickly. Acne usually begins to clear within 2 to 4 weeks after surgery.

Topical acne treatment: While waiting for hormone evaluation, a dermatologist may recommend gentle topical treatments such as low-concentration benzoyl peroxide (2.5%) to reduce breakouts. Retinoids or topical antibiotics may also be used for moderate cases.

Systemic antibiotics: Oral antibiotics are used only in severe cases. Doxycycline and minocycline are not safe for young children, so other options like amoxicillin are used if needed. Isotretinoin is considered only in rare, severe, scarring cases.

When to See a Dermatologist

  • Your baby's acne has not cleared by 3 to 4 months of age
  • Acne begins after 3 months rather than at birth or in the first weeks
  • The acne is getting worse rather than better
  • You notice rapid growth, early body hair, or unusual signs of hormone activity
  • Acne includes nodules or cysts, or scarring is starting to appear
  • You are concerned the rash may not be acne (the dermatologist can confirm the diagnosis)

Frequently Asked Questions

Why does my 6-month-old have acne?

When acne persists or starts after 3 to 4 months, it usually means your baby's body is producing an excess of androgens — hormones that stimulate oil glands. This is different from normal newborn acne, which is caused by the mother's hormones and clears on its own. Infantile acne needs medical investigation to find and treat the underlying cause.

Is this serious?

It can be, depending on the cause. Conditions like congenital adrenal hyperplasia (CAH) affect more than just the skin — they impact your baby's overall health and growth. The good news is that CAH is very treatable with hormone replacement. Getting an evaluation is important for your baby's well-being, not just for the acne.

What tests will my baby need?

A pediatric endocrinologist will typically order blood tests to measure levels of androgens, cortisol precursors (like 17-hydroxyprogesterone), and other hormones. They may also do an ACTH stimulation test and an ultrasound of the adrenal glands. These tests are not painful and most results come back within a few days.

Will the acne go away once the cause is treated?

In most cases, yes. When the underlying hormone problem is treated — whether through hydrocortisone for CAH or surgery for a tumor — acne improves significantly. For babies with CAH, acne typically clears 80 to 90% within 4 to 8 weeks. Even in cases of idiopathic (unexplained) androgen excess, many babies improve by 2 to 3 years of age as adrenal activity naturally decreases.

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Trusted Resources

Always consult a board-certified dermatologist or your healthcare provider for diagnosis and treatment of your specific condition. This article is for educational purposes only.