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Discover LudwigThe word 'discoloured' is correct and usable in written English.
You can use it to describe something that has changed color in an undesirable way, usually due to aging, damage, or contamination. For example, you might say: "The walls of the old house were discoloured by years of neglect."
Dictionary
discoloured
verb
Past of discolour
Exact(60)
Two days earlier I noticed something about the skin under John Kerry's eyes, smooth and slightly discoloured.
By then very yellowed and discoloured, it did not present an attractive sight.
For Europa, that evidence comes indirectly, from computer modelling of its interior and analysis of the brown streaks that cross its surface, which are thought to be salt deposits discoloured by solar radiation.For Enceladus, by contrast, the evidence is solid.
Its latex coating has flaked and discoloured in places.
The diseased part may at first be discoloured and cold to the touch; later it becomes distinct from nearby healthy tissue, turning dark and dry.
Most trees are susceptible to heart-rotting fungi that produce a discoloured, lightweight, soft, spongy, stringy, crumbly, or powdery heart decay.
It should not, however, be rank or discoloured.
Stems, which often shrivel and wither, show discoloured water-conducting tissue.
A maculopapular rash (discoloured elevations of the skin) appears on the trunk and quickly spreads to the limbs and head.
The most obvious sign of virus is that plants are distorted, the flowers or leaves streaked and flecked, discoloured or stunted in growth.
In the wrong hands, laser hair removal can cause post-inflammatory pigmentation – this is when the skin becomes inflamed and as a result will be permanently discoloured.
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CEO of Professional Science Editing for Scientists @ prosciediting.com