The scalp can become infected if fungus or bacteria enter through the hair follicles or damaged skin. Causes include ringworm, folliculitis, and impetigo. Bacteria cause some common infections, such ...
A cyst is a sac or cavity that may be filled with pus, semi-solid material, or air. It doesn’t usually cause pain until it gets large. An abscess is a painful, red infection that’s filled with pus. A ...
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