Is it possible to have a reaction - mild or otherwise - from handling 
lactose-containing products?

I have been making bottles for my granddaughter from a powder, which 
contains a fair amount of lactose.  Today, I seem to have mild symptoms, 
and it's not clear to me if it's a reaction to that (or maybe, in 
handling the powder, enough gets into the air and I ingest it) or 
something else.

Thanks

Eric