What Do Black Spots on a Leopard Gecko Mean?
Normal pigmentation
The classic leopard-print spotting most people associate with the species is simply the wild-type and many morph coloration patterns — spots that have been present since hatching or that match the gecko's established pattern are nothing to worry about.
When to look closer
A newly appearing dark spot, one that's raised, textured differently from the scales around it, or growing over time is worth monitoring and potentially having a vet look at, since it could represent a retained bit of shed, a healing injury, or in rare cases something requiring treatment.
Stress marks vs. pattern spots
Stress marking (temporary darker blotchy patches, often linked to handling or a startled response) is a different phenomenon from permanent pattern spotting and typically fades once the gecko settles.
When to involve a vet
Any dark area that's growing, oozing, or associated with lethargy or appetite loss should be checked rather than assumed to be pattern.
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A single adult leopard gecko needs a 20-gallon long tank as an absolute minimum, with a 36x18 in (40-gallon breeder) footprint now considered the recommended standard — plus a secure lid, an under-tank heater on a thermostat, a thermal gradient, at least three hides, and a shallow water dish.
Set up in this order: substrate, then heat source wired through a thermostat, then hides and water dish, then decor — and run the whole enclosure for at least 24–48 hours to confirm stable temperatures before your gecko moves in.
Hatchlings can start in a 10-gallon tank or tub, juveniles do well in 20 gallons, and adults need a 20-gallon long as an absolute minimum — with 36x18 in (40-gallon breeder) now the widely recommended standard, not just an upgrade.
Heat a leopard gecko enclosure with an under-tank heater and/or overhead heat source (halogen or deep heat projector) wired through a thermostat — a thermostat is mandatory, not optional, and heat rocks should never be used.
Leopard geckos can survive without UVB using dietary D3 supplementation, but current husbandry guidance now recommends low-level UVB (roughly 2–6% T5) as best practice — it improves D3 synthesis, bone density, and natural behavior, and views on it have shifted significantly from older nocturnal-species advice.
Keep ambient humidity around 30–40% across most of the enclosure, with a dedicated humid hide raised to roughly 70–80% to support smooth, complete sheds.