Tinea corporis
Introduction
Introduction Tineacorporis is a shallow fungal infection on smooth skin other than the hands, feet, perineum and thighs caused by dermatophytes. The so-called round sputum, money sputum and pen tube sputum of traditional Chinese medicine are similar to the scope of this disease. For example, "Theories of various diseases": "The shape of the round scorpion, the essays are hidden, the four sides are red, and the itch is also the same, and the worms are also in the worms." Concealing like money, gradually growing, or round or oblique, itching has a sputum, such as worms, sputum has juice. Chinese medicine believes that body phlegm is rheumatic evil, and guests are ill, or they are sick because of contact with unclean things. basic knowledge The proportion of illness: 0.03% Susceptible people: no specific population Mode of infection: non-infectious Complications: head lice
Cause
Body ailment
Pathogen factors (60%):
The disease is mainly caused by Trichophyton rubrum, Trichophyton rubrum, Trichophyton rubrum, Microporosporium rust, Microsporum canis.
Other reasons (20%):
It can also be spread from the patient's original handcuffs, athlete's foot, femoral hernia, armor, head lice and so on. The incidence is closely related to the body's resistance. Patients with diabetes and consumptive diseases are more susceptible to body ailments.
Life factor (10%):
The onset may be caused by direct or indirect contact with the patient's contaminated tub, bath towel, and the like.
Prevention
Body mole prevention
First, actively cure the hands, feet, nails, feces, children should pay more attention to the prevention and treatment of head lice, and avoid contact with cats, dogs and other animals, animals should also be actively treated, for chronic generalized adult body lice, should be carried out Systematic examination to rule out immune and endocrine disorders.
Second, keep the clothes clean. Patients with body lice should pay attention to changing underwear frequently, and the quilt needs to be changed frequently, paying attention to keeping private hygiene.
Third, when treating body lice, treat femoral hernia, athlete's foot or handcuffs at the same time to prevent repeated infection.
Fourth, try to keep your body dry, suitable for wearing loose underwear, but also to minimize the number of sweating. Reduce sweating and promote evaporation of the roots of the femur.
5. Self-contained, do not casually have sexual relations with others, and do not use casual underwear, underwear and toiletries.
Complication
Physical complications Complications
It can be complicated by bacterial infections, and the body mites caused by microsporum canis and gypsum-like microspores are more common in the face, neck and upper limbs, often accompanied by head lice, possibly because the patient scratches the scalp or combs the hair to spread the above parts. Causes infection.
Symptom
Because the bacteria invade the epidermis, they usually only parasitize the stratum corneum, so they only cause mild inflammation in the local area. They start with red papules or small blisters, and then form scales, which then gradually expand into a ring-shaped lesion with clear boundaries. It is often seen that papules, blisters, the surface is generally free of liquid, the edges are active, constantly expanding, and the center tends to subside, so there is a round or money, and some ring-shaped papules can appear in the ring skin lesions. Blisters, scales, and concentric ring damage, with varying degrees of itching.
Skin lesions vary with pathogens. The disease course of the body mites caused by Trichophyton rubrum is often more prolonged and more common. It is more common in the waist and abdomen, buttocks and trunk. It may have itching, and the pigmentation is often left behind. The body mites caused by Trichophyton rubrum invade the exposed parts of the cheeks and extremities, showing a ring shape or irregular shape, local inflammation is more obvious, itching is obvious, and bacterial infection can occur concurrently. The body sputum caused by flocculent sputum is more common in the lower back. Irregular shape, local inflammation is light, scales are thin and less, and itching is not obvious. The body mites caused by Microsporum canis and gypsum-like microspores are more common in the face, neck and upper limbs, often accompanied by head lice, possibly due to The patient scratches the scalp or combs the hair to spread the above-mentioned parts and causes infection. The body damage caused by the purple hairy fungus is often small (more than 5 cents), and the number is often multiple, often reddish papules. Then, it expands into a round shape around the periphery, with more edge pimples and small blisters.
There are many subtypes in the body.
Examine
Physical examination
Direct microscopic examination can be diagnosed after finding fungal hyphae or spores.
Histopathology: commonly used PAS staining, hyphae and spores can be found in the stratum corneum of the epidermis. Mycelium grows in parallel with the stratum corneum. When there is granulomatous damage, hyphae can be found in the hair follicle and upper part of the dermis, and the epidermis can be parakeratized. Excessive keratinization, thickening of the spinous layer, edema of the dermal papilla, infiltration of inflammatory cells around the blood vessels, and sometimes blister formation under the stratum corneum or epidermis.
Diagnosis
Physical diagnosis
It is mainly determined according to the clinical manifestations. If necessary, the dandruff can be scraped from the edge of the lesion for direct microscopic examination. After the fungal hyphae or spores are found, the diagnosis can be confirmed.
Differential diagnosis
1. Rose pityriasis: easy to be confused with body phlegm, but no disease above the neck, the skin lesions are oval, with marginal scales, inflammation is more pronounced, the long axis of the rash is consistent with the skin pattern, often the mother spot appears first, the fungal test is negative .
2. Seborrheic dermatitis: occurs in the fatty area, the damage is subacute inflammation, the surface is greasy with small scales, itching is severe, and the fungal test is negative.
3. Psoriasis vulgaris: The rash is sometimes ring-shaped, but the base is light red infiltration, covered with multiple layers of silvery white scales, a little bit of bleeding after stripping, occurs in the extremities of the extremities and articular surface, negative fungal examination.
In addition, it needs to be differentiated from chronic eczema, neurodermatitis, and simple pityriasis.
