ringworm (redirected from Tinea infections)

Ringworm 

Definition

Ringworm is a common fungal infection of the skin. The name is a misnomer since the disease is not caused by a worm.

Description

More common in males than in females, ringworm is characterized by patches of rough, reddened skin. Raised eruptions usually form the circular pattern that gives the condition its name. Ringworm may also be referred to as dermatophyte infection.

As lesions grow, the centers start to heal. The inflamed borders expand and spread the infection.

Types of ringworm

Ringworm is a term that is commonly used to encompass several types of fungal infection. Sometimes, however, only body ringworm is classified as true ringworm.

Body ringworm (tinea corporis) can affect any part of the body except the scalp, feet, and facial area where a man's beard grows. The well-defined, flaky sores can be dry and scaly or moist and crusty.

Scalp ringworm (tinea capitis) is most common in children. It causes scaly, swollen blisters or a rash that looks like black dots. Sometimes inflamed and filled with pus, scalp ringworm lesions can cause crusting, flaking, and round bald patches. Most common in black children, scalp ringworm can cause scarring and permanent hair loss.

Ringworm of the groin (tinea cruris or jock itch) produces raised red sores with well-marked edges. It can spread to the buttocks, inner thighs, and external genitals.

Ringworm of the nails (tinea unguium) generally starts at the tip of one or more toenails, which gradually thicken and discolor. The nail may deteriorate or pull away from the nail bed. Fingernail infection is far less common.

Causes and symptoms

Ringworm can be transmitted by infected people or pets or by towels, hairbrushes, or other objects contaminated by them. Symptoms include inflammation, scaling, and sometimes, itching.

Diabetes mellitus increases susceptibility to ringworm. So do dampness, humidity, and dirty, crowded living areas. Braiding hair tightly and using hair gel also raise the risk.

Diagnosis

Diagnosis is based on microscopic examination of scrapings taken from lesions. A dermatologist may also study the scalp of a patient with suspected tinea capitis under ultraviolet light.

Treatment

Some infections disappear without treatment. Others respond to such topical antifungal medications as naftifine (Caldesene Medicated Powder) or tinactin (Desenex) or to griseofulvin (Fulvicin), which is taken by mouth. Medications should be continued for two weeks after lesions disappear.

A person with body ringworm should wear loose clothing and check daily for raw, open sores. Wet dressings applied to moist sores two or three times a day can lessen inflammation and loosen scales. The doctor may suggest placing special pads between folds of infected skin, and anything the patient has touched or worn should be sterilized in boiling water.

Infected nails should be cut short and straight and carefully cleared of dead cells with an emery board.

Patients with jock itch should:

• wear cotton underwear and change it more than once a day
• keep the infected area dry
• apply antifungal ointment over a thin film of antifungal powder

Shampoo containing selenium sulfide can help prevent spread of scalp ringworm, but prescription shampoo or oral medication is usually needed to cure the infection.

Alternative treatment

The fungal infection ringworm can be treated with homeopathic remedies. Among the homeopathic remedies recommended are:

• sepia for brown, scaly patches
• tellurium for prominent, well-defined, reddish sores
• graphites for thick scales or heavy discharge
• sulphur for excessive itching.

Topical applications of antifungal herbs and essential oils also can help resolve ringworm. Tea tree oil (Melaleuca spp.), thuja (Thuja occidentalis), and lavender (Lavandula officinalis) are the most common. Two drops of essential oil in 1/4 oz of carrier oil is the dose recommended for topical application. Essential oils should not be applied to the skin undiluted. Botanical medicine can be taken internally to enhance the body's immune response. A person must be susceptible to exhibit this overgrowth of fungus on the skin. Echinacea(Echinacea spp.) and astragalus (Astragalus membranaceus) are the two most common immune-enhancing herbs. A well-balanced diet, including protein, complex carbohydrates, fresh fruits and vegetables, and good quality fats, is also important in maintaining optimal immune function.

Prognosis

Ringworm can usually be cured, but recurrence is common. Chronic infection develops in one patient in five.

It can take six to 12 months for new hair to cover bald patches, and three to 12 months to cure infected fingernails. Toenail infections do not always respond to treatment.

Prevention

Likelihood of infection can be lessened by avoiding contact with infected people or pets or contaminated objects and staying away from hot, damp places.

Resources

Other

"Ringworm." YourHealth.com Page. April 7, 1998. 〈http://www.yourhealth.com〉.

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ringworm /ring·worm/ (ring´-werm) tinea.

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ring·worm (rngwûrm)

n.

See tinea.

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ringworm.

See tinea.

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ringworm,

n a fungal infection of the skin, nails, and hair caused primarily by dermatophytes, symptoms of which include inflammation, patching, and scaling of lesions.

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ringworm

an infection of the superficial layers of the skin and the hair fibers with one of a group of dermatophytic fungi. Some of the fungi are obligate parasites of animals, others have the same relationship with humans, and some are freeliving in the soil and only invade animal skins in unusual circumstances. See also tinea. The common species are trichophytonverrucosum in cattle, T. equinum in horses; in dogs and cats the infections are microsporumcanis, M. gypseum and T. mentagrophytes. In sheep and goats the infection is usually T. verrucosum and in pigs M. nanum.

The infection is very superficial and does almost no injury to animals but efforts are usually made to prevent its spread because it is highly infectious, including for humans. In companion animals this zoonotic aspect is very important in management of cases. Called also dermatophytosis.

Ringworm lesions in a horse. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003

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honeycomb ringworm

see favus.

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ringworm

Tinea corporis, dermatophytid; dermatophytosis Dermatology A skin infection by mold-like fungi known as dermatophytes–eg, Trichophyton rubrum, T mentagrophytes, Microsporium canis, M gypsum, rarely also Epidermophyton; in children, T canis is the most common agent Clinical types Tinea corporis; tinea capitis–scalp; tinea cruris–groin, aka jock itch; tinea pedis–feet, aka athlete's foot DiffDx Nonfungal dermatopathies–eg, erythema annulare, 'herald patch' of pityriasis rosea, atopic dermatitis, other dermatitides Treatment Most resolve without therapy; otherwise, miconazole, if severe, griseofulvin. See Black dot ringworm, Gray patch ringworm, Tinea capitis, Tinea corporis, Tinea cruris, Tinea pedis.