Thanks for the query
Eczema is an allergy and not an infection. It is not communicable. Therefore you may safely have intercourse with your wife.
Only thing is eczema is not very common over scrotum
. Fungal infection
is commoner there and if a homeopath
has diagnosed it, i will recommend you show a dermatologist
for confirmation. Fungal infection can spread through close contact and it is easily treatable in a month's time if you start treatment early.
Hope this helped.
Take care and wish you a happy married life.