How is trichomycosis nodularis diagnosed?

In order for a diagnosis of trichomycosis nodularis (piedra) to be made, a doctor can perform a physical exam to check for the presence of clumps of fungus, or nodules. A doctor may also ask for a hair sample to analyze the exact type of fungus that caused the infection. These tests ensure that someone will get the best treatment possible to kill their specific infection. However, trichomycosis nodularis is often misdiagnosed as either head lice or tinea capitis, which are both different infections with different treatments. In order to best treat your hair infection, you must start with a correct diagnosis.