Fleas can survive in many environments. While fleas themselves are not poisonous, they feed on animal blood, insect feces, and organic debris, making them carriers of numerous bacteria and pathogens. When they bite human skin, they may transmit diseases such as plague. In this sense, fleas can be considered toxic.
Symptoms of Flea Bites
Individual reactions to flea bites vary. Some people experience no reaction, while others may develop erythema, papules, or urticaria. The affected skin area may become red, swollen, and intensely itchy, with a pinhead-sized purplish-red spot visible at the bite center. Blisters may form on the swollen surface.
Risks for Allergic Individuals
For those with allergies, flea bites may trigger skin conditions, particularly seasonal eczema. Bite sites develop raised macules of varying sizes (typically 0.5 cm in diameter), appearing larger and darker red with a distinct central spot in allergic individuals. These lesions cause intense, persistent itching lasting several days.
Hazards of flea bites for children
Children often exhibit pronounced symptoms after flea bites, presenting as papular urticaria with intense itching. Scratching commonly leads to scratch marks, scabs, or secondary infections.
Hazards of flea bites from rodents
>Fleas on rodents carry a tiny bacterium called Yersinia pestis. When fleas ingest the blood of plague-infected rodents, their bodies become saturated with this bacterium. If such an infected flea bites a human, the blood cannot reach the stomach due to bacterial blockage in the esophagus and instead flows back through the mouth into the victim's body. At this moment, the plague bacteria enter the human system, causing the plague.
Symptoms: The bite site becomes itchy. Scratching can introduce plague bacteria into tiny wounds, also causing infection. Flea bites appear as small red dots the size of a grain of rice.
What to do after a flea bite:
1. Clean the wound and apply calamine lotion, Tiger Balm, or anti-itch ointment. Use sulfur soap for bathing and maintain personal hygiene.
3. Spray disinfectant and insecticide throughout your home. Apply a 10% sulfur ointment evenly on your body and matting for several consecutive days. Don't worry about staining clothes—though the ointment smells unpleasant, it's harmless to the body and becomes effective upon skin contact, killing all external parasites.