Lymphocystis is a viral disease that causes cauliflower-like white or pink lumps on fish skin + fins. Self-limiting in healthy fish; primarily a cosmetic issue.
Lymphocystis virus, usually contracted from another infected fish or stress.
Always treat in a separate quarantine tank.
Reduce stress. Quarantine new fish. Pristine water quality supports immune response.
White or pink cauliflower-like lumps on skin or fin edges. Slow-growing, painless to fish. No behavior change.
Lymphocystis virus, usually contracted from another infected fish or stress.
No treatment needed: In most cases, lymphocystis self-resolves within 4-8 weeks. Maintain pristine water + low stress.
Reduce stress. Quarantine new fish. Pristine water quality supports immune response.
Cosmetic - rarely fatal
Browse the full disease database for 45 aquarium conditions with treatment protocols, or check the care library for prevention-focused husbandry guides. Use our symptom matcher to rank likely diseases from observed signs, the water parameter checker to diagnose related water-quality issues, or the QT timeline calculator to plan a treatment schedule.