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2. Bacteria

Bacteria are common culprits of scalp infections like folliculitis and impetigo, and often occur when bacteria enter the scalp through a break in the skin. With folliculitis, the infection causes inflamed hair follicles that become itchy bumps filled with pus. Impetigo afflicts mostly small children, spreads easily through infected clothing or other items, and causes red sores that rupture and later form a crust. A warm, humid environment raises the risk of developing both conditions.

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