The Nairobi fly, despite its name is not actually a fly. It’s a type of rove beetle, easily identified by its slender body and striking red-and-black colour. What makes this insect unusual is that it doesn’t bite or sting. Instead, it carries a potent chemical called pederin. When the beetle is crushed or pressed against the skin, this chemical is released causing a condition known as Paederus dermatitis, a rash that can become red, blistered and painful.
The beetles tend to be more active during the rainy season when humidity is high and vegetation is thick. In Kagio, where the rains have revived the green cover and brought cooler and damp nights, it’s not surprising to see a few of these insects near homes, especially in areas with outdoor lighting or open windows.
Their attraction to light often brings them into closer contact with people landing on clothing, bedding or exposed skin at night. The risk arises not from the beetle itself, but from the natural reaction to swat it away. Crushing it directly on the skin is what leads to the unpleasant burn-like reactions.
In most cases, the skin irritation appears within a day or two of contact. The rash may look like a red streak or patch, sometimes developing into blisters. It may itch or burn, but with basic hygiene and care, it usually heals within a few days.
In Kagio, the appearance of the Nairobi fly has been minimal and isolated. While the insects are around, they haven’t caused much disturbance or concern. For many locals, it’s a familiar sight that comes and goes with the seasons. A simple flick, some caution and a bit of soap and water are often all it takes to avoid any problems.
What to do if Skin irritation occurs
If skin irritation occurs after contact with the Nairobi fly, the first and most important step is to wash the affected area immediately with soap and plenty of clean water. This helps remove any remaining toxin before it spreads further. After washing, the area should be kept clean and dry. Applying a mild antiseptic cream or soothing lotion can help reduce discomfort. If there is itching, an antihistamine tablet or cream may help. It's important not to scratch or burst any blisters, as this can lead to infection. In case the irritation worsens, spreads or becomes very painful, it's best to seek treatment to avoid complications.
As the rainy season continues, the presence of the Nairobi fly serves as a small reminder of how nature shifts with the weather. Kagio’s residents, already used to the rhythms of the climate, continue with their routines aware, but unbothered.