For those cats suffering from skin allergy, this inflammatory reaction can cause itching, which then causes scratching which causes more itching, and so on. (felinedocs.com)
The presence of the eggs often produces a massive allergic response which, in turn, produces more itching. (sciencedaily.com)
Once the skin has been scratched severely; it then becomes increasingly irritated causing even more itching and increase the chances of a skin infection. (thepsoriasisprogram.com)