Many infections cause hair loss in men. One of the most common is ringworm. Ringworm is a fungus that grows in the scalp or areas surrounding the head. Another common infection that may lead to male hair loss is dermatitis, which simply means inflammation of the skin. It can cause hair loss if present in the scalp. Less common, folliculitis, or inflamed hair follicles, and syphilis can result in hair thinning in men. Each condition calls for a doctor's prescription.

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