What causes perioral dermatitis

Overview

Perioral dermatitis is a common facial skin rash that primarily affects the area around the mouth, but can also extend to the nose and eyes. It typically presents as a cluster of small, red, sometimes itchy or burning bumps and pustules, often with some scaling or dryness. While the exact cause remains somewhat elusive, a strong association exists with the use of topical corticosteroids, which are often prescribed for other facial skin conditions like eczema or rosacea. However, it's crucial to understand that perioral dermatitis is not an infection and is not contagious.

What are the Triggers and Causes of Perioral Dermatitis?

The development of perioral dermatitis is multifactorial, meaning several factors can contribute to its onset and persistence. The most frequently identified trigger is the prolonged or inappropriate use of topical corticosteroids on the face. These potent anti-inflammatory creams, when applied repeatedly to the facial skin, can paradoxically lead to a rebound inflammatory reaction and the characteristic rash of perioral dermatitis once the medication is stopped or its application pattern changes.

Beyond corticosteroids, a range of other external factors have been linked to perioral dermatitis:

• Cosmetic Products: Heavy or oil-based cosmetics, moisturizers, and facial cleansers, particularly those containing ingredients like isopropyl myristate or sodium lauryl sulfate, can clog pores and irritate the skin, potentially triggering or worsening the condition. Some individuals find that certain sunscreen formulations also contribute to their symptoms.
• Toothpastes: The inclusion of fluoride, sodium lauryl sulfate, or flavoring agents like cinnamon in toothpastes has been identified as a potential trigger for perioral dermatitis, especially in cases where the rash is predominantly around the mouth.
• Environmental Factors: Prolonged exposure to harsh weather conditions, such as strong winds and intense sunlight, can compromise the skin's barrier function and lead to irritation, which may contribute to the development of perioral dermatitis in susceptible individuals.
• Hormonal Influences: While not a direct cause, hormonal fluctuations, particularly in women during pregnancy or related to oral contraceptive use, have been observed to coincide with outbreaks or worsening of perioral dermatitis. This suggests a potential underlying sensitivity influenced by hormonal shifts.
• Other Medications: While less common, some systemic medications have been anecdotally linked to perioral dermatitis.

Understanding the Mechanism

The precise mechanism by which these factors lead to perioral dermatitis is not fully understood. However, it is believed to involve a disruption of the skin's natural barrier function, an alteration in the skin's microbiome, and an inflammatory response. Topical steroids, for instance, suppress the immune response in the skin, which can lead to an overgrowth of certain microorganisms and a subsequent inflammatory reaction when the steroid is withdrawn. Similarly, irritants in cosmetics or toothpastes can damage the skin barrier, allowing for easier penetration of allergens or microbes, and triggering an inflammatory cascade.

Who is at Risk?

Perioral dermatitis most commonly affects women between the ages of 15 and 45. However, it can occur in men and children as well. Individuals with a history of rosacea or other sensitive skin conditions may be more prone to developing perioral dermatitis.

Diagnosis and Treatment

Diagnosis is typically made based on the characteristic appearance of the rash and its distribution. A dermatologist may perform a skin scraping to rule out fungal or bacterial infections. Treatment aims to remove the offending agent and reduce inflammation. This often involves discontinuing topical corticosteroids and switching to milder skincare products. Topical antibiotics (like metronidazole or clindamycin) or oral antibiotics (like tetracycline or doxycycline) are commonly prescribed. In more severe cases, oral isotretinoin might be considered.

Prevention

Preventing perioral dermatitis involves avoiding known triggers. This includes limiting the use of potent topical corticosteroids on the face, opting for gentle, fragrance-free skincare and cosmetic products, and being mindful of toothpaste ingredients. A consistent, simple skincare routine that focuses on maintaining the skin's barrier function is also recommended.