Can insect bites trigger psoriasis?

Thanks, that`s brilliant! My initial symptoms were not as severe as yours, just this small patch of rough skin. Then three years later, whoops! I got an awful fright, I thought it was melanoma. I wondered whether a mouse spider might have caused it. I have read that psoriasis can lie dormant for up to a decade and then erupt so that also fits. Never mind, the trip to Oz was fantastic and I`ll get back if I can. Scabby.