pine caterpillar dermatitis
Introduction
Introduction to pine caterpillar dermatitis Dendrolimus dermatitis refers to an acute dermatitis caused by exposure to the venom of the pine caterpillar body, often accompanied by joint damage, and is more common in young adults who participate in agricultural labor. Clinical manifestations include dermatitis, arthritis, and cysts, with varying degrees of fever, headache, general malaise, and superficial lymphadenopathy near the lesion. basic knowledge The proportion of the disease: the probability of the population is 0.14% Susceptible people: no special people Mode of infection: non-infectious Complications: joint pain
Cause
The cause of pine caterpillar dermatitis
Causes:
Lesiocam pidaae, a larvae and its moltings, has a large amount of venom on the cockroaches. It can cause disease after contact with human body. In addition, it can also contact weeds contaminated with toxic hair. Or water source and cause illness.
Pathogenesis:
After contact with the human body, it can cause illness. Within a few minutes, it is local itching, and then there is a bright red edema rash or wheal. A few can form blisters. The skin lesions are mostly in the neck, shoulders, chest and back and limbs. In addition, it can also cause disease by contacting weeds, fertilizers or water sources contaminated with toxic hair. According to domestic survey data, dead insects are more toxic than live worms.
Prevention
Pine caterpillar dermatitis prevention
Initiate the masses, remove egg fragments and mites, catch larvae, trap and kill moths, adopt biological control measures, and use natural enemies (red-eye bees, red-headed hawksbills and swallows, crickets and other birds) to mix properly and make individuals Protect work and avoid contact with poisonous hair.
Complication
Pine caterpillar dermatitis complications Complications, joint pain
Caterpillar dermatitis refers to the pruritic and inflammatory skin diseases caused by the venom of the caterpillar's venom or stinger. The complications may include auricular inflammation and ophthalmia, and the auricular deformity may be left behind after the auricular inflammation. Severe ophthalmia can cause blindness, and even secondary infection or local lymphangitis.
(A) skin damage: usually within a few minutes to ten minutes after exposure to venom, found in the exposed parts of the limbs. Common are papules, edematous erythema or wheal, with blisters in between, extremely itchy, and burning sensation.
(B) joint symptoms: occurred within a few days after the onset, often invading the small joints of the hands and feet, local redness and pain, there are very sensitive tender points.
(C) systemic symptoms: patients with bone and joint symptoms and severe skin lesions often have systemic symptoms, such as fever, chills and loss of appetite.
Symptom
Symfflux of pine caterpillars Common symptoms Mosquito bites inflammation joint swelling gout joint deformity hypothermia papules edema
Patients are more common in young and middle-aged farmers, forestry labor, mainly manifested as dermatitis, arthritis, in addition to the presence of lumps, auricular inflammation and ophthalmia.
Dermatitis: After exposure to poisonous hair, it will feel local itching within a few minutes, and then there will be red edema rash or wheal. A few can form blisters. Skin lesions are often found in the neck, shoulders, chest and back and limbs. After treatment, it will heal in about 2 to 3 months.
Arthritis: It usually appears within a few months after contact, or it can grow up to 10 to 20 days. It is more common in the exposed parts of the sputum, fingers, knees, wrists, elbows, ankles, etc., with unilaterality, only 1 ~ 2 joints are involved, affected joint swelling and pain, function is limited, usually 1 to 2 weeks can be resolved, some patients can also be extended for several months, a small number of recurrent attacks, the formation of joint deformities, severe cases can be accompanied Low heat.
Lump: more common in the limbs and hand and foot contact parts, local soft tissue and tendon forming a mass, the number is one, gradually swollen, soft, fluctuating, puncture may have bloody exudate or pus, after self-cracking self-healing, The course of disease is 1 to 2 months, and there are also those who have been prolonged. The above three types of damage can be single or simultaneous in the same patient.
A small number of patients may have auricular inflammation, ophthalmitis, and auricular deformity may be left behind after auricular inflammation. Ophthalmitis may be caused by iridocyclitis, scleritis, etc., and severe cases may cause blindness.
Examine
Examination of pine caterpillar dermatitis
Blood white blood cell count, erythrocyte sedimentation rate, and anti-streptolysin "O" titer were not abnormal except for individual.
X-ray examination: the invaded joint can be seen first, the bone is limited, the trabecular bone is blurred or interrupted, and then the edge of the bone is blurred, and the mouse is bitten or worm-like. Most patients have a single layer of thin strip near the bone destruction area. The periosteal reaction, some patients with bone-like protrusions, individual lace-like, severe cases can be seen asymmetry narrowing of joint space, and some visible dislocation.
Diagnosis
Diagnosis and identification of pine caterpillar dermatitis
There are contact with pine caterpillar venom, weeds contaminated with venom, history of fertilizer or water source. After exposure to venom, it will be local itching within a few minutes, followed by bright red edema rash or wheal, and a few can form blisters. The skin lesions are often found in the neck, shoulders, chest and back and limbs.
