Although there are millions of species of fungi, only about 300 of them can actually cause infections in humans. There are several types of fungal infections that can affect your skin.
In this article, we’ll take a closer look at some of the most common fungal skin infections and the ways they can be treated and prevented.
What is a fungal skin infection?
Fungi live everywhere. They can be found in plants, soil, and even on your skin. These microscopic organisms on your skin typically don’t cause any problem, unless they multiply faster than normal or penetrate your skin through a cut or lesion.
Since fungi thrive in warm, moist environments, fungal skin infections can often develop in sweaty or damp areas that don’t get much airflow. Some examples include the feet, groin, and folds of skin.
Often, these infections appear as a scaly rash or discoloration of the skin that is often itchy.
Some fungal skin infections are very common. Although the infection can be annoying and uncomfortable, it’s typically not serious.
Fungal skin infections are often spread through direct contact. This can include coming into contact with fungi on clothing or other items, or on a person or animal.
What are the most common fungal skin infections?
Many common fungal infections can affect the skin. In addition to the skin, another common area for fungal infections is mucous membranes. Some examples of these are vaginal yeast infections and oral thrush.
Below, we’ll explore some of the most common types of fungal infections that can impact the skin.
Ringworm of the body (tinea corporis)
Contrary to its name, ringworm is caused by a fungus and not a worm. It typically occurs on the torso and limbs. Ringworm on other areas of the body can have different names, such as athlete’s foot and jock itch.
The main symptom of ringworm is a ring-shaped rash with slightly raised edges. The skin inside these circular rashes usually looks healthy. The rash can spread and is often itchy.
Ringworm is a common fungal skin infection and is highly contagious. It’s not serious, though, and can usually be treated with an antifungal cream.
Athlete’s foot (tinea pedis)
Athlete’s foot is a fungal infection that affects the skin on your feet, often between your toes. Typical symptoms of athlete’s foot include:
- itching, or a burning, stinging sensation between your toes or on the soles of your feet
- skin that appears red, scaly, dry, or flaky
- cracked or blistered skin
In some cases, the infection can also spread to other areas of your body. Examples include your nails, groin, or hands (tinea manuum).
Jock itch (tinea cruris)
Jock itch is a fungal skin infection that happens in the area of your groin and thighs. It’s most common in men and adolescent boys.
The main symptom is an itchy red rash that typically starts in the groin area or around the upper inner thighs. The rash may get worse after exercise or other physical activity and can spread to the buttocks and abdomen.
The affected skin may also appear scaly, flaky, or cracked. The outer border of the rash can be slightly raised and darker.
Ringworm of the scalp (tinea capitis)
This fungal infection affects the skin of the scalp and the associated hair shafts. It’s most common in young children and needs to be treated with prescription oral medication as well as antifungal shampoo. The symptoms can include:
- localized bald patches that may appear scaly or red
- associated scaling and itching
- associated tenderness or pain in the patches
Tinea versicolor
Tinea versicolor, sometimes called pityriasis versicolor, is a fungal/yeast skin infection that causes small oval discolored patches to develop on the skin. It’s caused by an overgrowth of a specific type of fungus called Malassezia, which is naturally present on the skin of about 90 percent of adults.
These discolored skin patches most often occur on the back, chest, and upper arms. They may look lighter or darker than the rest of your skin, and can be red, pink, tan, or brown. These patches can be itchy, flaky, or scaly.
Tinea versicolor is more likely during the summer or in areas with a warm, wet climate. The condition can sometimes return following treatment.
Cutaneous candidiasis
This is a skin infection that’s caused by Candida fungi. This type of fungi is naturally present on and inside our bodies. When it overgrows, an infection can happen.
Candida skin infections occur in areas that are warm, moist, and poorly ventilated. Some examples of typical areas that can be affected include under the breasts and in the folds of the buttocks, such as in diaper rash.
The symptoms of a Candida infection of the skin can include:
- a red rash
- itching
- small red pustules
Onychomycosis (tinea unguium)
Onychomycosis is a fungal infection of your nails. It can affect the fingernails or the toenails, although infections of the toenails are more common.
You may have onychomycosis if you have nails that are:
- discolored, typically yellow, brown, or white
- brittle or break easily
- thickened
Prescription medications are often required to treat this type of infection. In severe cases, your doctor may remove some or all of an affected nail.