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Hi Teresa,
Great picture. This condition I believe is typically caused by cold or spasm. Although this is evidence of impaired circulation, it is not necessarily a sign of latency in the luos. The fact that it clears after a short while is somewhat diagnostic. On the other hand I suppose given the rest of your statement, it might be something you see with emptying of the luos. The nodules seem more diagnostic to me.
When we create latency for survival we will fund that latency so this mottling you are seeing would be more permanent. It could increase or decrease depending on stress levels but it is unlikely it would disappear, unless it left behind some superficial vessels.