Social media users in Beijing and several other places have reported seeing small black-and-red insects in their homes: rove beetles.

Rove beetles resemble large ants. These slender beetles are usually no more than 1 centimeter long, each with alternating black and red bands, a black head, a black tail, and wings folded and hidden on the back.

Experts warn that if a rove beetle lands on your skin, never swat it or squash it. Instead, gently flick it away, blow it off, or use a piece of stiff paper or a similar object to remove it. Rove beetles do not actively bite people, but if they are swatted or crushed, the highly acidic, toxic fluid in their bodies can get onto the skin and cause chemical burns. Once on the skin, the toxic fluid quickly causes redness, blisters, and even pustules, accompanied by an intense burning sensation. If the fluid gets into delicate areas such as around the eyes, mouth, or nose, it can also cause swelling and irritation of mucous membranes. Improper care of the affected area can also lead to secondary bacterial infections.

If you accidentally crush the insect on your skin, wash the area as soon as possible with plenty of soapy water and then rinse with running water to dilute and remove any remaining toxic fluid to reduce skin damage. If the toxic fluid gets around the eyes, rinse directly with clean water instead of washing with soapy water. After washing, do not apply alcohol, povidone-iodine, toothpaste, or any folk remedies, and do not scratch the affected area, to avoid secondary infections. If discomfort persists, or if extensive burns, blisters, pustules, or other symptoms appear, seek medical care from a dermatologist as soon as possible, apply topical medication as directed by a doctor, and, if necessary, take oral antihistamines or antibiotics.

Rove beetles are attracted to light and are most active at night. When at home, people are advised to keep fine-mesh window screens closed, draw the curtains at night, reduce indoor light spilling outside, and check bed seams and crevices before going to sleep. In the evening and at night, try to avoid spending long periods in damp areas with lots of insects, such as grassy areas, woods, and lawns. If you must go, it is best to wear long sleeves and long pants to minimize exposed skin.

(Source: Beijing Fabu)