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In page Carotenosis:

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Carotenoids are deposited in the intercellular lipids of the stratum corneum, and the color change is most prominent in regions of increased sweating and thickness of this layer. This includes the palms, soles, knees, and nasolabial folds, although the discoloration can be generalized. The primary factor differentiating carotenoderma from jaundice is the characteristic sparing of the sclerae in carotenoderma, which would be involved in jaundice if the bilirubin is at a level to cause skin findings. In contrast to jaundice, carotenoderma is reported to be better observed under artificial light. It is of note that lycopenemia is specifically associated with discoloration of the soft palate and deposition in the liver parenchyma.[citation needed]