Dermatophytosis (patient information)
Dermatophytosis On the Web
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Ringworm is a skin infection due to a fungus. Often, there are several patches of ringworm on your skin at once.
What are the symptoms of Dermatophytosis?
Symptoms of ringworm include:
- Itchy, red, raised, scaly patches that may blister and ooze.
- The patches tend to have sharply-defined edges.
- Red patches are often redder around the outside with normal skin tone in the center. This may look like a ring.
If ringworm affects your hair, you will have bald patches.
If ringworm affects your nails, they will become discolored, thick, and even crumble.
What causes Dermatophytosis?
Ringworm is common, especially among children. However, it may affect people of all ages. It is caused by a fungus, not a worm like the name suggests.
Ringworm can affect the skin on your:
- Beard -- tinea barbae
- Body -- tinea corporis
- Feet -- tinea pedis (also called athlete's foot)
- Groin area -- tinea cruris (also called jock itch)
- Scalp -- tinea capitis
Ringworm can spread easily from one person to another. You can catch ringworm if you touch someone who has the infection, or if you come into contact with items contaminated by the fungus, such as combs, unwashed clothing, and shower or pool surfaces. You can also catch ringworm from pets that carry the fungus. Cats are common carriers.
The fungus that causes ringworm thrive in warm, moist areas. Ringworm is more likely when you are often wet (such as from sweating) and from minor injuries to your skin, scalp, or nails.
Most of the time, your health care provider can diagnose ringworm by looking at your skin. The fungus may glow when your skin is examined with a blue light (called a Wood's lamp) in a dark room.
Tests to confirm the diagnosis may include:
- KOH exam
- Skin biopsy
- Skin culture
When to seek urgent medical care?
Call your doctor right away if you have any signs of a bacterial infection, which can result from scratching. These signs include swelling, warm skin, sudden worsening in redness of the patches, red streaking, pus, drainage, and fever.
Call your doctor if:
- You have ringworm on your scalp or beard
- Your skin does not improve after 4 weeks of self-care
- The rash spreads and you have diabetes or a weakened immune system due to disease or certain medications
To care for ringworm:
- Keep your skin clean and dry.
- Apply over-the-counter antifungal or drying powders, lotions, or creams that contain miconazole, clotrimazole, or similar ingredients.
- Don't wear clothing that rubs against and irritates the area.
- Wash sheets and nightclothes every day while you are infected.
Your health care provider may prescribe pills to treat the fungus if you have:
- A severe case of ringworm
- Ringworm that keeps coming back or that lasts for a long time
- Ringworm in your hair
You may need medicines such as ketoconazole, which are stronger than over-the-counter products. You may also need antibiotics to treat skin infections from strep or staph that are caused by scratching the area.
Infected pets also should be treated.
Where to find medical care for Dermatophytosis?
To prevent ringworm:
- Keep your skin and feet clean and dry.
- Shampoo regularly, especially after haircuts.
- Do not share clothing, towels, hairbrushes, combs, headgear, or other personal care items. Such items should be thoroughly cleaned and dried after use.
- Wear sandals or shoes at gyms, lockers, and pools.
- Avoid touching pets with bald spots.
What to expect (Outlook/Prognosis)?