Stage IV Small Cell skin discolaration

I failed to mention or inquire about skin discolaration. My husband is an African American and both hands have turned white. Is this associated with his cancer at all or possibly to any medications he may be taking? What is it? I don't have access to asking the doctors some of my questions due to the fact, as I have mentioned, my husband is an inmate. My information is very limited. If my husband doesn't remember to ask these questions, they don't get asked nor does information get volunteered in his case. Can someone help?