There are quite a number of kangaroos on this property and when that happens there is generally a lot of kangaroo ticks, which become very active during cool wet weather. Around 4-5 days ago one bit me on the neck and as you cannot initially feel them on your skin, it was probably there for a while and only became noticeable when the bitten area started to itch.
I removed it without much trouble, but later my neck swelled up to some size and became very hot and incredibly itchy. Although the swelling has now subsided a little it still remains intermittently itchy. The itching possibly reflects an allergy on my part to whatever they pump into you.
Anyway, I was sitting at my desk just now when I noticed a dirty brown blob smeared on the inside of a lens from my reading glasses. When I took them off, there in the center of the lens was another tick and very much alive, which must have attached itself to me when I took the dog for a walk earlier and it had crawled up my clothing, onto my neck and over my face.
The area of my neck that had been bitten before had become incredibly itchy about the time the tick would have been on my neck and my scratching probably sent if further up onto my face and eventually my glasses. However, it illustrates how they can crawl over you completely undetected, although now I seem to feel them all over me, so extensive scratching is currently rampant.