A. I have to admit that I am not very experience with cichlids but I think the differentials in this case (considering the previous antibiotic treatment) are :
- Lymphocystis and epitheliocystis : to get more information about the disease have a look at https://edis.ifas.ufl.edu/fa181
- fungal and parasite infection
Unfortunately if the lump will grow from the nose inside the mouth could lead to inappetence.
I hope my answer was helpful!
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