What is this?

[MrsBugmaster]

I have a latticed butterfly in QT for about 10 days now and it is started to show a white fluffy cotton spot on it's back. See photo. Does anyone know what it is and what treatment to use

 

[snorvich]

Lymphocystis. Treat food with an additive such as selcon or vita-chem. Nothing serious, it will go away by itself.

 

[MrsBugmaster]

Thanks!