September 10, 2026, 8:01 am | Read time: 3 minutes
A disease previously known mainly in veterinary medicine is now drawing attention from health authorities. In recent months, an unusually high number of infections with the bacterium Dermatophilus congolensis have been reported in several European countries. Germany has also reported its first cases. Learn more about the so-called dermatophilosis and its possible symptoms at FITBOOK.
RKI Reports First Cases in Berlin and Brandenburg
The Robert Koch Institute (RKI) reports a total of 16 confirmed cases of the rare skin disease in Germany since December 2025. Affected areas include Berlin and Brandenburg.
The disease is caused by the bacterium Dermatophilus congolensis. Dermatophilosis is colloquially known as “rain scald” or “rain rot.” According to the European health authority ECDC, the pathogen has so far been primarily detected in cattle and other animals.1 Human cases were long considered rare.
However, the current infections in Europe suggest that human-to-human transmission through close physical contact might be possible.
Possible Skin Changes
In humans, the infection primarily manifests as skin changes. Typical signs include:
- reddened or sensitive skin areas,
- small nodules or bumps,
- pimples and pustules,
- scaly or crusted skin patches,
- blisters or small wounds,
- itching or burning.
The symptoms can appear in various body regions. Changes have been described on the hands, arms, legs, face, as well as in the groin and genital area.
Recent cases in Europe have included inflammations resembling inflamed hair follicles or pimples. Reports from France also noted papules on the neck and upper body, as well as skin changes in the groin, scrotum, and buttocks.
Diagnosis Only Possible Through Examination
The symptoms cannot be definitively attributed to dermatophilosis. Many other skin conditions can cause a very similar appearance. Therefore, simply looking at the rash is not enough to confirm the disease. Whether Dermatophilus congolensis is indeed the cause must be medically clarified.
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Possible Transmission Routes Under Investigation
Previous human cases were mostly linked to contact with infected animals. In the current European cases, experts see indications that human-to-human transmission might also be possible.
Particular focus is on close skin contact, including sexual contact. According to reports on the German cases, visits to so-called sex-positive saunas played a role. Additionally, experts are examining whether shared surfaces in warm, humid environments could contribute to the spread.2
Risk to the Population Currently Low
According to current assessments, the risk to the general population remains low. So far, known human infections have been mostly mild.
Anyone noticing unusual skin changes that itch, crust, or spread should have them examined by a doctor. This is especially true if the symptoms persist or worsen over time.