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Bites and Infestations. Scabies: Infestation of the skin by the human itch mite, Sarcoptes scabiei. The initial symptom of scabies are red, raised bumps that are intensely itchy. A magnifying glass will reveal short, wavy lines of red skin, which are the burrows made by the mites.
However, if you have scabies and it is cleared with treatment, and then you catch it again, the symptoms may be slightly different. In such instances the rash and itching develop much more quickly - often within a day or two. This is because the first scabies infestation has already sensitised your immune system.