This symptom may due to skin disease or systemic disease. Pruritus may also be idiopathic. The site most clearly linked to pruritus is the dermo-epidermal junction.
Pruritus can be either acute or chronic, with the chronic form lasting for 6 weeks or longer.
Chronic pruritus can be classified according to skin changes or based on aetiology.
Clinical classification of chronic pruritus according to skin changes may be characterised as;
itching on primarily diseased, inflamed skin
pruritus on primarily normal, non-inflamed skin
itchy skin with chronic secondary scratch lesions. (1)
Reference:
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