What Are the Most Common Causes of a Petechial Rash?

Several rough allergic mediators are stored in the rough bristles of the plant surface. If it comes in contact with the skin, allergens in it will invade the skin and cause an allergic reaction. Typical red lines, erythema and wind masses may appear on the skin.

Plant dermatitis

Plant dermatitis concept

Causes of plant dermatitis

Causes of plant dermatitis:

1. Several rough allergic reaction media are stored in the rough bristles of urticaceae plants.

2. The roots, stems, leaves, and flowers of cactus and Dieffenbachia plants contain a highly irritating white emulsion, which may cause erythema, blisters, and even hair loss when the skin comes into contact with it.

3. Fennel, phoenix flower, bergamot and other plants contain substances that make human skin allergic to sunlight. After human skin contacts these plants, if exposed to the sun for several hours, red spots and blisters with burning pain will appear in the exposed parts. Small blisters often fuse into bullae the next day. After the blisters have subsided, skin pigmentation often remains, and some remain for months.

4. The sap of figs flows onto the skin and the skin becomes brown after sun exposure, as if strong coffee flows onto the skin. Grass dermatitis, which occurs after walking in pastures and grass, is a kind of plant photodermatitis. Edible rapeseed, amaranth, purple laver and other vegetables can also make the skin allergic to light and cause solar dermatitis.

5. As plants can cause various dermatitis, you should strengthen the protection of your skin when you go out to play, reduce the exposed parts of the skin, and do nt trample on the plants and climb the leaves. Otherwise, it will damage the natural environment and make yourself a victim. .

Clinical manifestations of plant dermatitis

Clinical manifestations of plant dermatitis:

1. Significant non-depression edema occurs on the face and back of the hand, the surface is tense and shiny, and the texture is soft and solid.

2. Swelling of both eyelids makes the eyelids closed and cannot be opened, the lips are valgus, the opening of the mouth is restricted, the skin is diffuse slightly flushed or purplish red, and there are petechiae or petechiae, pimples, blisters, etc. The latter can be fused to each other into bullae, the content is clear or pale yellow, or bloody.

3. After the blister ruptures, an erosive surface, or an ulcer or necrosis appears. Scars appear after the ulcer heals and pigmentation remains.

4. Occurs on facial protrusions such as eyebrow arch, crotch and back of nose, forearm, back of hands, feet, neck and nails, symmetrically distributed. Most patients develop the disease within one day after sun exposure. A short few minutes of local skin itching. More common in summer, more women than men.

Diagnosis: According to the history of excessive consumption or exposure to related plants and intense sunlight before the onset, edema and ecchymosis are common in exposed areas, more common in summer, more women than men, conscious symptoms and systemic symptoms, etc. Can be confirmed.

However, it is reminded that you must identify several diseases:

1. The contact dermatitis rash is mostly limited to the contact part, and there is a clear history of contact. The rash has nothing to do with the sun and the season, and it has nothing to do with gender.

2. Niacin deficiency The damage of this disease is also in the sun, but there are often prodromal symptoms such as general malaise, fatigue, and insomnia before the onset of disease. In addition to the rash, there are gastrointestinal symptoms and neuropsychiatric symptoms, and it is not difficult to distinguish.

Plant Dermatitis Treatment Options

First, local treatment

(1) For newly-developed skin lesions, light mossification and scratching blood scab marks, which are distributed on both sides of the neck, or in the area of the elbow socket, 0.1% mometasone furoic acid cream (trade name Eloxone ) Or compound econazole cream (parison), 2 times a day, or topical o.04% dexamethasone azone wipes, 1 to 2 times a day.

(2) Dermatitis distributed around the eyes, the above-mentioned drugs should be used topically if necessary. If necessary, the time should be short. Once the skin lesions have disappeared, use hydrocortisone butyrate (such as Udrol), but it should not be too long. To avoid causing adverse reactions.

(3) Hypertrophic lichenoid skin lesions distributed on the elbows, iliac crests, and knees can be applied externally with Fuzhengning plaster, which should be changed every other day. Those who are allergic to adhesive tape should not use it. Can also be used topically as a 0.05% lumetasone cream, or 0.05% fluocinolone dimethyl sulfoxide liniment, or as a topical 0.1% betamethasone cream. The above medicines are used twice daily. For itching that is not severe and is distributed on the elbows and palate, topical 2% coal tar gel or dermatitis tincture, or topical 0.1% triamcinolone ointment.

(4) For mossy lesions where the area of refractory skin is limited to elbows, knees, iliac crests, etc. is 4cmz in size, local closure therapy can be used when the general method is not effective: 0.25% o ~ O.5% hydrochloric acid Lucaine (skin test required) 10 to 20 ral was injected into the base of the lesion. Prednisolone 0.2 0.4ml (containing 25mg of prednisolone per ml) plus O · 25 9/6 0.5% procaine 10 20ral for infiltration and injection of the base of the lesion. Prednisone The dosage is generally not more than 25rag, twice a week. Once the skin lesions have subsided, you can apply topical glucocorticoid cream or cream topically and maintain it every other day.

(5) For generalized neurodermatitis, almost all skin lesions can be applied topically with 0.04% ketone lotion and 0.05% fluocinolone dimethyl sulfoxide liniment, which is only used on the limbs and cannot be applied systemically Rub so as not to absorb too much and have adverse reactions. Trunk lesions can be treated with phenol calamine lotion, 5% coal tar lotion, or anti-allergic antipruritic solution. This case is mainly based on systemic treatment.

Second, systemic treatment

(1) Oral antihistamines and sedatives can be given to those with severe itching.

(2) Apply the Tripterygium wilfordii extract or Tripterygium glycosides to patients with extensive skin lesions, 2 tablets, 3 to 4 times a day, and if necessary, add 15-30 mg / d of prednisone, orally. Decrease the above two drugs after the skin lesions have subsided for one week. Generally, one tablet is reduced every week, which can be controlled flexibly according to individual differences.

Third, traditional Chinese medicine treatment

(1) direct application of Sophora flavescens, ground skin, white fresh skin, snake bed, three times a day, for conditioning and maintenance treatment of dermatitis

Plant Dermatitis Prevention

Some people develop vegetative solar dermatitis, which may be a specific allergic reaction to certain wild vegetables. The pathogenesis is that after eating wild vegetables, light-sensing substances are absorbed into the blood through the intestine, and then reach the skin through the blood. If it is not exposed to the sun, it will not cause discomfort, but if exposed to direct sunlight, For a long time, it will cause the body to absorb a large amount of light energy in sunlight. This light energy can stimulate the light-sensitive substances in edible plants to react chemically to produce haptens, and then combine with proteins to make the body have the corresponding antigenicity. Once encountering similar experience again, it will cause immune damage and induce a special allergic dermatitis, that is, vegetal solar dermatitis.

Phytosolar dermatitis usually develops within 1-3 days after eating wild vegetables. Early consciously exposed skin areas such as the face, earlobe, and back of the hand produce skin tightness, burning, itching, or crawling sensation, followed by diffuse swelling, solid and bright, with varying degrees of itching in the above areas. The back of individual hands There may also be blisters of varying sizes. At the same time, patients may also experience symptoms such as headache, dizziness, low fever, fatigue, and loss of appetite.

Plant solar dermatitis can be completely prevented, that is, people pay attention to reduce going out after eating wild vegetables, especially to reduce the chance of being directly exposed to strong light. Those with a history of allergies are advised not to pick light-sensitive wild vegetables such as gray ash, amaranth, etc. If the above clinical manifestations occur after eating, the first thing is to stop eating such wild vegetables in the future and avoid direct sunlight. Secondly, it is necessary to go to the hospital in time to seek medical treatment, and to take medication under the guidance of a physician, and the efficacy and prognosis are good.

Plant Dermatitis Dermatitis Health

I. Prevention and prognosis of plant dermatitis:

Avoid excessive food intake and contact with the plants involved, and do not expose them to strong sunlight.

Health care of plant dermatitis:

1. Those with specific allergies should not eat some wild or planted vegetables with colored stems and leaves (especially purple-red), or avoid insolation for about 3 days after eating, which can reduce the incidence of this disease.

2, after eating wild vegetables, reduce going out, especially to reduce the chance of being directly exposed to strong light. For those with a history of allergies, it is best not to pick edible wild vegetables such as gray vegetables and amaranth.

3. Immediately stop eating pathogenic plant vegetables and avoid sunlight. B vitamins and vitamin C are taken orally.