If the chick has a red bump on only one side of the neck, I would wonder how that connects, if at all, to the tongue problem. Again, if it
were part of an abscess, it could cause the tongue to retract. If it were an abscess, simple amoxicillin would suffice; topical medicine like a cream wouldn't work.
Does the bump on the neck feel warm? Is it compressible at all? Do you have a knitting hook with a well-rounded tip to use as a probe to see if the spot in the mouth is compressible? The hook otherwise could be used to gently scrape from the back of the tongue forward,
catching any hair or string.