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How is folliculitis diagnosed?
The diagnosis of folliculitis is generally based on the appearance of the skin. In some situations, a microbial culture of the pus will help to detect an infectious cause. It may be necessary to pull out some of the affected hairs and examine these microscopically using potassium hydroxide in order to detect fungal infections. Occasionally, a small skin biopsy may be used to help the doctor confirm the diagnosis. Infectious causes include bacteria, fungi, and parasites. Usually, no specific blood tests are needed in the diagnosis of common folliculitis.