I believe I have a poison ivy rash on my right knee, and I ve just been putting Caladryl on it which has helped so far. I just noticed, however, that the top of my right foot (and somewhat up to my lower right calf/shin) is very swollen and shiny. It doesn t itch, but if I graze my fingernails across it it feels a temporary relief like scratching an itch would. Below my knee and the poison ivy rash has been somewhat itchy, but not noticeably.