From my class notes:
If you get bitten by fleas, it is best to break the flea life cycle by treating the home, the pets, and the outside environment with insecticide. Home foggers and flea collars are not always effective. Birds and fish must be protected during spraying. If home treatments are ineffective, professional extermination may be needed.
An over-the-counter 1% hydrocortisone cream can help relieve itching.
Other common treatments for flea bites are:
wash the bites with antiseptic soap to reduce the risk of infection.
apply an ice pack frequently to help relieve swelling.
use calamine lotion, anesthetic creams or similar to treat the itching.