Sneezing chin

My ~2 month old chinchilla has been sneezing for about a week now, and that is the only symptom he has. His eyes are clear and he has no drippy nose or eyes at all. He seems fairly itchy and wipes his nose a lot but otherwise is very active and happy.

Does anyone know what this is?

He sneezes even when there is no hay or bath powder to make his nose irritated and I don't know if he is sick or maybe just has allergies? I also just switched from Kaytee bath powder to Blue Sparkle in hopes it will help-but it's only been two days since then so I'm not sure..

Thanks!