Can you take a picture (close) and post it? It might help.
When I have been bitten by fleas it itches for a short time. When I have hives, it itches, but the hive and itch usually go away within an hour.
Mosquito bites itch for days on my skin, but I'm allergic.
Maybe you are allergic to fleas? Around the ankles sounds right, but on your stomach, I don't know.
