Fungus
A doctor can order a culture of the infected area in order to determine the type of fungus. If the infection is a result of dermatophytes, there is a chance that different organisms are co-occurring. However, it is more common to find one or more species on a patient’s feet. Several cultures would reveal a greater number of mixed infections.
A doctor can confirm the diagnosis of tinea cruris by examining a skin scraping for mycology. If the rash is symmetrical, a biopsy will help identify the fungus. If the fungus is present, septate hyphae can be seen on a biopsy. To rule out other conditions, a skin biopsy may be necessary. The sample is also necessary to rule out other flexural rashes.
A biopsy is the best way to determine the cause of tinea cruris. A biopsy of the affected area will show if it’s a fungal or dermatophyte infection. A mycological biopsy will demonstrate if the infection is a fungus or not. If it’s not, a dermatologist will recommend a different treatment option. In addition, a dermatologist will be able to rule out other skin conditions by using a bacteriological test.
A diagnosis of tinea cruris is often difficult. The condition presents as a red or brown scaly rash in the inguinal fold, but it can spread to the lower abdomen and pubic region. In some cases, it will extend to the buttocks and perineum. While the penis is rarely involved, it can be affected if the affected person is overweight or has a history of obesity.
