Lymphocystis generally doesn't require treatment (little can be done anyway). If the water quality is ok and the fish is otherwise fit and healthy it should go away without intervention.
Lymphocystis is virus infection. There are many strains of the virus and each seems to be rather specific to a certain fish family if not species, so it is rather unlikely that that other fish will get infected - unless you have more of the same species or family.
Two things can be done:
1. Boost the fish's immune system with food additives like beta glucan and of course make sure that the water quality is good and the fish is not constantly stressed out.
2. If the growth is on the edges of the fins you could cut it off. But this is something I would generally advise against. The only cases where physical removal is indicated is when the growth is is impairing the fish from eating or swimming.
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