A very high eosinophil count
plus leg swelling could indicate lymphatic filariasis
and hence tests to exclude this is definitely recommended.
1. Peripheral blood for filarial antigen
2. or filarial antigen test
3. total IgE (helpful, but does not tell what allergies, if you have any)
4. depending on other symptoms, such as skin rash
etc; you would need mast cell
If MCT is very high, you must see a Haematologist straight away.
I hope this helps.