Chronic or acute inflammatory diseases
such as eczema, urticaria, lichen planus and to a lesser extent psoriasis, parasitic dermatoses such as scabies
Insect bites, accidental exposure of skin to medicines
Insect bites, but also some instances of accidental exposure of skin to medicines and bullous pemphigoid.
Pruritus may also be a symptom of a neurological, psychiatric or liver disorder or of a lymphoma such as Hodgkin's disease.