I'm unconvinced that sometimes the mind doesn't decide to make one feel itchy without external reason. I know I get itchy sometimes with no obvious cause.
I've started with what my gp says is hives, mine are a raised very itchy bumps or what I called heat lumps, usually where my clothes are tight to my skin. I get one and then a couple of days later get another one. At the moment I'm trying to ease the itch with calamine lotion. Looking at my medication there is a tablet I take regularly which has a side effect of hives, I haven't taken the tablet for a couple of days now and had no more itchy lumps. I'm hoping that is the culprit. I also have a antihisitimine nasal spray. It is a really depressing complaint I hope I have found the reason for them now.