@lindacarol - Welcome to Mayo Clinic Connect Linda. I am glad that you found us. May I ask how long you have been on Keytruda? Itching seems to be a common side effect of Keytruda. Have you been given anything for relief?

Here is some information about Keytruda and possible side effects
https://www.mayoclinic.org/drugs-supplements/pembrolizumab-intravenous-route/side-effects/drg-20122552