Ladybugs, those small, often colorful beetles, are generally considered harmless and even beneficial insects. Ladybugs can occasionally deliver a harmless “nibble” or “pinch.” This interaction is rare and poses no threat. This behavior is usually accidental or defensive, rather than an aggressive act toward humans.
Why Ladybugs “Bite”
Ladybugs may “bite” or “pinch” humans under specific circumstances, often linked to the search for moisture or a mistaken food source. During dry periods or heat waves, they might explore human skin in an attempt to find water or nutrients. Sometimes, they might also mistake the salts and other substances on skin for their typical food, such as aphids. This exploratory behavior, rather than an intentional attack, can result in a minor pinch.
A common cause for concern stems from the Asian lady beetle (Harmonia axyridis), which is frequently mistaken for a native ladybug but is more prone to nibbling. These beetles, an invasive species introduced to control pests, are known to occasionally deliver a pinch, especially as cooler weather approaches. They may seek warmth and shelter indoors, gathering in large groups around windows or other reflective surfaces, increasing the likelihood of human interaction and subsequent nibbles. When disturbed or handled, Asian lady beetles are more likely to exhibit this behavior.
What to Expect from a Ladybug Nibble
A ladybug nibble feels like a slight pinch or pinprick. It rarely causes pain or breaks the skin. Ladybugs are not venomous, and they do not transmit diseases to humans.
In most instances, no specific treatment is required after a ladybug nibble. Washing the affected area with mild soap and water is a good general hygiene practice to remove any potential irritants or residues. If there is any minor swelling, redness, or itching, applying a cold compress can provide relief. Allergic reactions are uncommon, but some individuals may experience mild redness, a raised bump, or irritation.
Distinguishing from Other Insects
Differentiating a ladybug nibble from other insect irritations can be challenging. Other small beetles or even mites might cause similar minor skin sensations. Distinguishing a ladybug, or more commonly an Asian lady beetle, from these other insects is possible through visual cues.
Asian lady beetles often have a distinct “M” or “W” shaped black marking on the white area behind their head, which native ladybugs lack. Their color can vary from light orange to bright red, and they may have a varying number of spots, or even no spots at all. Native ladybugs are usually bright red with black spots and have a more rounded shape compared to the slightly more oval Asian lady beetle.