Hi there
This is a question best answered by a medical professional, preferably your doctor.
In researching your question it seems that this condition is rare and can be misdiagnosed. Here is some information about diagnostic techniques. In this informational article it seems that a complete blood work up is the initial step towards diagnosis as well as a skin biopsy.
Here is another article you may want to read on leukemia cutis and it also shows images.
Let us know if you need further information. Thank you for your question.
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