Beard ringworm, medically known as tinea barbae, is a fungal infection of the skin in the beard area. It is a dermatophytosis, meaning a fungal disease caused by dermatophytes.
Dermatophytes are a type of filamentous fungus. They infect only the skin of humans and animals. This makes them “classic” causative agents of skin fungal infections. Skin fungal infections are also referred to by the umbrella term tinea. In addition to tinea barbae, there is, for example,
In general, diseases caused by fungal infections are referred to as mycoses. They frequently affect the lungs or the mucous membranes of the gastrointestinal or urogenital tracts.
In the case of dermatophytes, they affect only the skin. Dermatophytes feed on keratin, the main component of the stratum corneum. Skin fungi therefore occur only
- in the skin and its appendages,
- in hair follicles, and
- in fingernails and toenails.
Dermatophytes multiply particularly well in warm, moist environments. Therefore, common sites of transmission are warm, moist places such as
- saunas,
- public showers,
- swimming pools,
- exercise mats, or
- gyms.
The fungal pathogen is transmitted through direct contact with the skin.
Direct transmission from person to person is also common. Possible scenarios include, for example, wrestling matches or sexual intercourse.
Animals can also be affected by skin fungi. Some fungal pathogens can infect both animals and humans. These pathogens are called zoophilic species. Therefore, transmission from animals to humans is also possible.
Zoophilic fungal pathogens usually cause deeper and more persistent infections (tinea profunda) than purely geophilic (soil-dwelling) or anthropophilic (human-specific) dermatophytes.
This also applies to the pathogens that cause tinea barbae. Beard ringworm occurs primarily in rural areas, where those affected have close contact with cattle or other infected animals. Simply touching the animal with your hand and then scratching your chin with that same hand can be enough.
Handling livestock is a common cause of beard ringworm infection © littlewolf1989 | AdobeStock
If the affected person also has a weakened immune system, the risk of infection increases. People with
.
The causative dermatophytes here are primarily
- Trichophyton mentagrophytes (primary host: rodents) and
- Trichophyton verrucosum (primary host: cattle),
- but also other Trichophyton and Microsporum species.
Beard ringworm appears as round, reddened patches that form scaly rims and may also ooze. It is always accompanied by severe itching, which causes those affected to scratch.
Beard ringworm is usually a deep-seated infection. The fungi are primarily located in the hair follicles. There, they cause inflammation that resembles severe acne: boil-like nodules and pustules form, some of which can swell to a considerable size. Eventually, they burst, draining pus. The entire area then forms a crust. The affected beard hairs can usually be plucked out very easily.
If the inflamed areas are large enough or if several of these furunculous lesions merge, an abscess may even form: a pus-filled cavity becomes encapsulated under the skin, cutting it off from the outside world and the immune system.
In severe cases of beard ringworm, there may also be swelling of the regional lymph nodes
- behind the ear,
- on the sides of the neck, or
- under the lower jaw
. Fever is also possible.
Although beard ringworm can heal on its own, it leaves behind a scar where beard hair will no longer grow. In addition, the infection can last quite a long time. This means that, in addition to the pain and itching, it also poses a cosmetic and social problem for the person affected.
Therefore, if you experience the symptoms described, you should see your primary care physician promptly. They will diagnose the underlying condition and initiate treatment. You may also be referred to a dermatologist.
Dermatologists can usually recognize tinea barbae at a glance. If the patient’s medical history (contact with animals) matches the clinical presentation (newly developed, furuncle-like inflammation of the beard hair), this is usually sufficient for diagnosis.
If the condition or its causative agent remains unclear, a tissue sample is needed to identify the pathogen. To do this, the doctor takes a swab from the scaly outer edge of the inflamed skin area. Under the microscope, the characteristic filamentous fungi become visible, confirming the diagnosis of tinea barbae.
In some cases, it may be necessary to identify the exact fungal species using a fungal culture.
To do this, the fungus from the sample is cultured on a suitable medium. This can take anywhere from one to more than four weeks. If sufficient growth occurs, it is possible to determine exactly which pathogen is present. This also allows for assessments of the effectiveness of the antifungal medications used. This is particularly relevant in cases of treatment failure.
Detecting the fungus is also important in relation to possible differential diagnoses. Various conditions present with symptoms similar to those of beard ringworm:
- severe acne,
- furunculosis, or
- carbuncles caused by bacteria
are among the possible suspects here. Immune deficiency disorders such as AIDS could also be a possibility.
Tinea barbae is treated with topical and systemic antifungal medications. These are active ingredients that prevent fungi from multiplying and kill them.
When applied topically, they provide relief from many fungal skin infections within just a few days. However, they must be applied regularly over an extended period (a few weeks). Only then do the active ingredients achieve a reliable, long-lasting effect.
Beard ringworm is a difficult and deep fungal infection. Therefore, systemic therapy is often unavoidable. “Systemic” means that the medication can then take effect throughout the body’s entire “system.” The patient takes tablets for this purpose.
Unfortunately, this can also lead to side effects. These include stomach upset and, potentially, liver damage. Most antifungal medications put a strain on the liver. Prerequisites for systemic treatment of beard ringworm are therefore
- healthy liver function and
- possibly a blood test to monitor liver function.
Beyond that, systemic therapy is safe and well-tolerated for most people.
Possible active ingredients include azole antifungals or terbinafine. A thorough, hygienic, and complete shave is recommended.
