Causes of tinea corporis and tinea cruris:
1, which is related to the patient's own resistance.
The resistance of the body is related. When suffering from diabetes or other systemic diseases, long-term use of hormones and immunosuppressive substances will reduce the body's immunity, and even a small amount of fungi can cause tinea corporis.
2. The living environment is damp and dark.
The pathogen of tinea corporis and tinea cruris is easy to breed in dark and humid environment. If you live in this state for a long time, it will not only cause tinea corporis and tinea cruris, but also lead to other diseases.
3. Direct contact transmission.
Anyone who has direct contact with the diseased parts of patients with tinea corporis and tinea cruris will carry the pathogens of tinea corporis and tinea cruris, so the transmission between husband and wife is very fast, especially sexual transmission. But it is not only husband and wife's life that can spread the disease, but only direct contact with tinea corporis and tinea cruris can spread it.
4. Indirect contact.
Most of them are infected by contact with patients with tinea corporis and tinea cruris or by cats and dogs. , or indirectly through clothing, appliances, or infected by tinea pedis first, and then spread through scratching. In summer, the climate is hot and humid, and people sweat a lot, especially in the thighs. If you don't take a bath in time, or wear tight underwear, a lot of sweat can't evaporate, and you are prone to get this disease.
5. Effects of other diseases.
Diabetic patients with excessive leucorrhea, long-term oral or local application of a large number of broad-spectrum antibiotics or corticosteroids, are also prone to tinea corporis and cruris. Judging from the incidence rate, it is mainly young people, and men are more than women. This disease mostly occurs in summer, often aggravated by humid or hot climate, and relieved or cured in winter.
Manifestations of tinea corporis and tinea cruris:
1, tinea corporis: the severity of inflammatory reaction depends on the immune response of pathogenic bacteria and host. Hair follicle is the accumulation of infection, so the rich parts of hair follicle will show stronger inflammatory reaction. The incubation period is usually 1 ~ 3 weeks. The infection spreads centrifugally from the site that invades the skin, and the center fades, forming typical annular lesions of different sizes, which can also be arc or spiral. Most lesions have scales. If glucocorticoid preparations are used locally, scales will be reduced or disappeared (it is difficult to distinguish tinea), and itching and burning will be felt consciously.
Other clinical types of tinea corporis include deep tinea corporis, Majocchi granuloma and tinea imbricata. Deep tinea corporis is an excessive inflammatory reaction of the body to dermatophytes (similar to pyonephrosis on scalp), which can be manifested as granuloma or verrucous damage. Majocchi granuloma is caused by Trichophyton rubrum, which is characterized by pustules or granulomas around hair follicles. Common in women who suffer from tinea pedis or onychomycosis and often shave their legs. Infected hair appears after penetrating the hair follicle wall. Skin lesions can exist widely and proliferate, which can be seen in immunosuppressed people. Tinea imbricata is a kind of dermatomycosis caused by Trichophyton concentric. It is a concentric ring, and most of the rings have white upturned scales, which are free to the heart edge, and the centrifugal edge is close to the leather surface, and sometimes the scales fall off and leave light brown concentric circles.
2, tinea cruris: more common in men (scrotum can provide a humid and warm environment), often related to tinea pedis, other susceptible factors include obesity and hyperhidrosis. Typical damage boundary is clear, the edge is convex, red, movable, with scales, and there may be pustules or blisters on the edge. Skin lesions are annular at first, which can develop into peristalsis and can occur unilaterally or bilaterally. Usually scrotum is not involved. If scrotum is involved, cutaneous candidiasis should be considered.
What about tinea corporis and cruris?
1, local treatment: the first choice, commonly used imidazole drugs are 1% bifonazole, 2% miconazole, 1~3% clotrimazole, 2% ketoconazole, 1% econazole, 2% sertaconazole, etc. Propylamine drugs include 1% naftifine, 1% terbinafine or 1% butenafine preparation; Others include 2.5% amodofen, 65,438+0% ciclopirox amine and 2% lirananaphthalate. For external use, 65,438+0 ~ 2 times, daily/kloc-0 times, lasting 2~4 weeks. Patients with tinea cruris, tinea corporis and infantile tinea cruris should choose mild drugs.
2. Systemic treatment: For refractory systemic tinea corporis, deep tinea corporis, giant granuloma and tinea imbricata, systemic antifungal drugs can be selected for treatment. Itraconazole 200mg/d 1 week, taken with meals; Children 5 mg/kg d terbinafine 250mg/d 1 week; The child weighs 40kg and 250mg a day. Fluconazole 150~200mg/ time, weekly 1 time, with a course of treatment of 2~4 weeks; Children 6 mg/kg.w Because tinea imbricata fungi can often reach the spinous layer, the course of oral antifungal drugs is generally more than 2~3 months, and the lesions need to be consolidated after all the lesions have subsided 1~2 weeks.
3, Chinese medicine treatment: Chinese medicine believes that tinea corporis and cruris is caused by unreasonable skin hygiene, damp heat and insect poison invading the skin, so it is appropriate to clear away heat and promote diuresis, kill insects and relieve itching. Golden Sophora flavescens Bungarus nourishing lotion is composed of honeysuckle, Sophora flavescens, Agkistrodon, Viola yedoensis, etc. Has the effects of clearing away heat and promoting diuresis, killing insects and relieving itching, resisting bacteria and bacteria, and removing toxic substances. It can fundamentally eliminate various stubborn ringworm such as tinea corporis, tinea manus and tinea pedis, and also inhibit the regeneration of tinea bacteria.
Preventive measures for tinea corporis and cruris;
1. Eliminating infection factors: Since tinea corporis and cruris is mostly caused by other tinea diseases, it is necessary to treat tinea corporis and cruris at the same time, such as tinea capitis, tinea manus and tinea pedis. Contact with other people or animals suffering from tinea should also be avoided, otherwise tinea corporis and tinea cruris will recur due to fungal reinfection even after treatment.
2, adhere to the correct medication: many drugs can treat tinea corporis and cruris, but some patients still can not be cured after replacing various drugs, which is mainly due to improper methods. External use of drugs to treat tinea is simple and easy, but it must be applied 2 ~ 3 times a day, and the scope of application should be slightly larger than the area of skin lesions. Even if the rash subsides and itching is not obvious, it must be persisted for a period of time. Never fish for three days and dry the net for two days, just like mowing the grass without removing the roots. Although the illness can be temporarily relieved, you will be tall again in the spring breeze when you meet the right conditions.
3. Avoid using corticosteroid ointment: in other words, hormonal drugs cannot be used externally. Corticosteroid ointment such as Fusong ointment, Dexamethasone ointment, Betamethasone ointment and some traditional Chinese medicine ointment containing hormones can be used for a variety of allergic skin diseases, such as eczema, contact dermatitis, neurodermatitis and so on, with good results. However, tinea corporis and tinea cruris are caused by fungi. Hormones can't kill fungi, but they can promote their growth and reproduction, making tinea disease develop faster and more seriously. Therefore, external drugs should not be abused at will.
4. Actively treat systemic diseases: If tinea corporis and tinea cruris are caused by systemic diseases, they should be actively treated to enhance their resistance. If tinea corporis and tinea cruris are caused by long-term use of corticosteroids or immunosuppressants, these drugs should be used as little as possible or not when conditions permit.
5. When the condition is serious, cooperate with internal medicine: If tinea corporis and cruris rash is widely distributed, in addition to external medicine, oral antifungal drugs, such as griseofulvin and ketoconazole, can be cooperated. However, these drugs have certain side effects, such as liver and kidney damage, so they should be taken under the guidance of a doctor, and liver function should be checked regularly during treatment.
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Articles on etiology of tinea corporis and cruris:
1. Etiology of tinea corporis and tinea cruris
2. What are the causes of tinea cruris?
3. How is beriberi formed?
4. How to treat tinea cruris? Effective treatment.
5. Causes of tinea pedis