Nipple Dermatitis During Breastfeeding

Nipple dermatitis in a exclusive pumping mother

Nipple pain is one of the leading causes of early breastfeeding cessation. Among the diagnoses attributed to it, mammary candidiasis, commonly called "thrush" , holds the top spot. Yet contact or atopic dermatitis of the nipple and areola is in practice far more common, and requires a completely different approach. Confusing the two is problematic: an antifungal treatment applied to a dermatitis actively makes the situation worse.

Nipple Dermatitis

Dermatitis , or eczema, affects the breasts extremely commonly, and the areola in particular, including in women who are not breastfeeding. It is even more common during lactation, for multiple reasons. It is the number one cause of misdiagnosis of "thrush" in patients.

Clinically, it presents as a red, painful, burning rash with flaking. One breast may be affected without the other, with no obvious explanation.

Three subtypes are distinguished:

Irritant Contact Dermatitis (ICD): caused by direct physical or chemical trauma to the skin. In the context of breastfeeding, the areola is most often affected. Mechanical trauma during feeds is the most frequent trigger. It differs from allergic contact dermatitis in that it typically spares the nipple itself.

Allergic Contact Dermatitis (ACD): a hypersensitivity reaction occurring after repeated exposure to an allergen. The risk of ACD of the nipple or breast is at its highest during the postnatal period. Unlike ICD, ACD more readily affects the nipple itself. Soaps, detergents, shampoos, fabric softeners, and textiles are common sources of allergens.

Atopic Dermatitis: an exacerbation or first manifestation in women with a pre-existing atopic background, often triggered by a topical product applied to already-compromised skin.

Triggering Agents: Often Iatrogenic

This is where a significant paradox lies.

The most frequently implicated topical agents are antifungals and antibacterials such as those found in APNO (All Purpose Nipple Ointment), petroleum jelly, lanolin, coconut oil, and emollients found in creams, lotions, or ointments.

Breastfeeding accessories are also implicated: pump parts, nursing bras, breast pads, new detergents or soaps, and nipple shields.

Substances ingested or touched by the infant , including antibiotics and solid foods introduced during weaning , may also be a factor.

Antifungal creams worsen pain and vasospasm, and can cause dermatitis. They are not indicated for use on nipples.

The Particular Case of Lanolin

Lanolin is the star ingredient in nipple creams marketed as "breastfeeding-specific." Yet it is a well-documented contact allergen. I discuss this in [this article].

The Case of APNO

APNO contains an antifungal, an antibacterial (also harmful to the nipple, capable of causing dermatitis), and a corticosteroid. It is the corticosteroid alone that provides relief. If a corticosteroid is indicated, it should be prescribed separately (e.g. triamcinolone 0.1%).

Why Does the "Thrush" Diagnosis Persist?

Current protocols in some guidelines diagnose mammary candidiasis based on nipple pain accompanied by shooting or stabbing breast pain between feeds, associated with pink shiny nipples and fine white flakes ,prescribing oral fluconazole and topical antifungals on the nipple-areolar complex and in the infant's mouth.

The concept of nipple candidiasis has been called into question by several publications, as I mention in this article.

Persistent nipple pain, especially with colour changes and shooting pain between feeds, is frequently misdiagnosed as thrush. Antifungals may provide temporary relief without addressing the actual cause. A thorough history and careful clinical examination are essential to distinguish between diagnoses.

Management

Identify and Remove the Triggering Agent

This is the essential first step: a systematic review of all topical products used (nipple creams, balms, sprays), accessories (breast pads, nipple shields, pump parts), detergents, and solid food introduction if the infant is older. A single breast affected points to localised contact , one should look for what the mother or infant is touching or applying on one side only.

Targeted Anti-Inflammatory Treatment

A short course of prescription corticosteroid resolves a persistent case within a few days, combined with a barrier effect using a non-allergenic balm (e.g. pure shea butter).

Regarding use on the nipple, current recommendations allow topical corticosteroids to be applied to the nipples immediately after a feed for eczema, with gentle cleansing of the nipple before the next feed. Only water-miscible cream or gel formulations should be used on the breast, as ointments may expose the infant to high levels of mineral paraffins through licking.

What Not to Do

Even a single application of an antifungal (e.g. nystatin) or a drying agent (vinegar, baking soda, gentian violet) can damage or break down the skin's protective layer (the acid mantle) and trigger a cascade of worsening eczema, inflammation, pain, and rash.

Conclusion

Nipple dermatitis is the primary differential diagnosis for supposed thrush. It is frequently induced or worsened by products applied as nipple "care": lanolin, APNO, antifungals, multi-ingredient balms. Treatment rests on removing the triggering factor and prescribing a short course of topical corticosteroid not an antifungal. APNO should be avoided: its only effective component is the corticosteroid it contains, which can be prescribed on its own without the other harmful agents. A rigorous clinical history focusing on products used, accessories, and unilateral contact is usually sufficient to guide the diagnosis without additional investigations.

References

Physician Guide to Breastfeeding (physicianguidetobreastfeeding.org)

Moore H, Stevenson A. Breast and Nipple Dermatoses During Lactation. Australas J Dermatol. 2025 Nov;66(7):e386–e407. doi: 10.1111/ajd.14586. Epub 2025 Aug 15. PMID: 40817612; PMCID: PMC12633704.

Douglas P. Re-thinking lactation-related nipple pain and damage. Womens Health (Lond). 2022 Jan–Dec;18:17455057221087865. doi: 10.1177/17455057221087865. PMID: 35343816; PMCID: PMC8966064.

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Feel free to contact me for advice or questions: My Baby Moon by Elise Armoiry, IBCLC Lactation Consultant & founder of My Baby Moon.

Over 2,000 families supported since 2014. Doctor of Pharmacy by training, specialising in breastfeeding and infant sleep.

Email: info@mybabymoonibclc.com

Tel: 00337.49.50.67.82

Website: mybabymoonibclc.com

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