Dextroluma are generally not susceptible to the same diseases found among most organic species.  The same bacteria and viruses that infect humans do nothing to them.

They can occasionally get crossover illnesses from funguses not native to Aerius, or from biological species with similar enough cellular structures to their own (reproductive compatibility tend to be a good basis to determine whether typical diseases can cross over), although this is extremely unusual and generally is just treated with rest and eating a higher than usual amount of their own mushrooms.  These illnesses are typically marked by their glow color and their eyes dimming during the illness, and then strengthening back to normal as they recover.

Advanced medical technologies and magic have eradicated most other diseases that were once common on Aerius, and only a few now remain.

LUMACHROMIA

While it is far from certain if Lumachromia is an illness or an autoimmune disorder, there is some belief that it may be caused by a short-lived virus.  This is disputed hotly, as it’s proven difficult to try to track potential transmissions and exposures, but as evidence has not been able to be produced for the other hypothesis, more medical professionals lean to believing it to be a virus.

Lumachromia typically appears unexpectedly.  One moment a dextroluma’s eyes are their natural white - or the grey or black of a necrosis infection treated or untreated - and the next, they begin to take on the natural glow color found on that dextroluma’s fins and freckles.  Sometimes an individual with Lumachromia only discovers it due to contracting necrosis, if their glow color is white.  Lumachromia is known to occasionally cause difficulties with sight, though the difficulties that individuals who experience this side effect have vary wildly.

NECROSIS

Necrosis is the most prominent disease currently on Aerius, and has proven a very difficult problem to manage, even after the creation of a medication to suppress it.  This is because it is essentially a parasitic fungus, and most known treatments for fungal diseases are harmful to dextroluma.

For more information on Necrosis, this author recommends reading the book 'Necrosis & The Cure'.