Red-leg
Red-leg is reddening of the skin on the belly and legs caused by a bacterial infection (often a sign of septicaemia) — a genuine emergency that needs a reptile/exotics vet.
It is usually a symptom of poor water quality or stress letting bacteria take hold. If you see it, correct the environment and get the animal to a vet promptly — do not try to treat it yourself.
We triage, we don't diagnose: red belly + legs is a "see a vet now" sign.