From Leopard Gecko Wiki
A Super Hypo or Super Hypomelanistic Leopard Gecko is a Leopard Gecko which has no black spots on its back. Super Hypos can range from a dull to a bright yellowish color. Super Hypo is a line bred trait, unlike the Hypos which are thought to be Co-dominant. Many Super Hypos look like Hypos until adulthood but will lose their spots as they age.
JK Herp. <http://jkherp.com>.