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Chronic pruritus of unknown origin is most prevalent among older adults and causes severe itching lasting longer than six weeks.

That can cause pruritus — the medical term for itch — though not usually this severe.

Mosquito bites are the most common source of acute itch — or pruritus, in doctor-speak.

The last dermatologist thought he might have scabies — tiny mites barely visible to the naked eye that can live on the body and cause intense itching, or pruritus.

We examined the patients’ plasma before and after treatment with gefitinib and documented changes in chemokines and leukocyte counts associated with the extent of rash or the presence of pruritus.