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1 Head Lice Bites: Itchy, Red Bumps Lice bites appear as little red bumps on the scalp, head, and shoulders, and cause the skin to become inflamed and intensely itchy. 2  If you scratch your lice bites, it may cause them to become infected.
Rarely, cysts form deep abscesses. Long-term cystic acne can cause scarring that manifests as tiny and deep pits (icepick scars), larger pits, shallow depressions, or areas of hypertrophic scarring. Acne conglobata is the most severe form of acne vulgaris, affecting men more than women.