Brown-Tail Moth Rash: Symptoms, Duration and Treatment

Brown-tail moth rash is a skin condition caused by contact with the toxic hairs of the brown-tail moth caterpillar. The rash typically develops when these tiny, barbed hairs embed into the skin, leading to an allergic reaction, according to the NPS.

This reaction results in red, itchy bumps that can form clusters and spread across the affected area. The rash is common in areas exposed to the caterpillar's hairs, such as the arms, neck, and face.

The severity of the rash can vary, with some individuals experiencing mild irritation and others suffering from intense itching and inflammation.

Causes

• Contact with caterpillar hairs: The primary cause is direct contact with the brown tail moth caterpillar's toxic hairs.
• Airborne hairs: The hairs can become airborne and cause a rash when they land on the skin.
• Contaminated clothing or surfaces: Touching clothing, bedding, or surfaces contaminated with the caterpillar's hairs can also lead to the rash.
• Seasonal activity: The risk of developing the rash is higher during late spring and summer when the caterpillars are most active.

Brown tail moth rash looks like small, red bumps on the skin. These bumps may form clusters and spread.

The rash is often itchy and can become inflamed. It may also develop into a blistering condition if scratched.

Look for raised, red bumps that are itchy and in clusters. The rash typically appears on exposed skin areas.

Initial symptoms

• Tingling or burning sensation on the skin
• Red bumps appearing shortly after contact

As the rash progresses, the itching can become more intense. The rash area may also swell and become more irritated. The rash can cause significant itching and discomfort. Scratching may lead to further irritation and potential skin infections.

The duration of a brown tail moth rash can vary depending on the severity of the reaction and the individual's skin sensitivity. Typically, the rash lasts for a few days to a couple of weeks. In most cases, the intense itching and redness subside within a week.

However, if the rash is severe or if there has been extensive contact with the caterpillar hairs, the symptoms might persist for up to two weeks. Proper care and avoiding further exposure to the hairs can help shorten the duration of the rash.

Treating brown tail moth rash involves a combination of relieving symptoms and preventing further irritation. Here are some steps to manage the rash:

• Clean the affected area: Gently wash the skin with soap and water to remove any remaining caterpillar hairs.
• Avoid scratching: Scratching can worsen the rash and lead to infections. Keep nails short to minimize damage.
• Cool compresses: Applying cool, wet compresses can help reduce itching and swelling.
• Moisturize: Use gentle moisturizers to soothe dry and irritated skin.
• Avoid further exposure: Stay away from areas where brown-tail moth caterpillars are present, and wear protective clothing when necessary.
• Consult a healthcare professional: If the rash is severe or persists, seek medical advice for additional treatment options.