Itching can be caused by a number of conditions. It is usually a symptom of an underlying cause such as allergies or a bug bite.
There are a number of treatments for itching including medications. Common drug classes used to treat itching are alpha hydroxy acids, tricyclic antidepressants, antihistamines, antiprotozoals, antiprotozoal / corticosteroid combinations, quinolone antibiotic / corticosteroid combinations, corticosteroids, corticosteroid / keratolytic combinations, and skin barrier emollients.