Over the past couple of months, I have noticed a single raised reddish spot on my right upper thigh that becomes obvious every now and then. It looks like a welt, or insect bite, but is always in the exact same spot, and occurs on its own out of nowhere. It has itched a couple of times, but for the most part I only notice it when tracing my fingers over my leg. It is irregularly shaped, and will appear and disappear within about 12 hours. I am curiously concerned, as this is about the 6th time it has appeared over the course of around 3 or 4 months. Should I be worried? Should I make an appointment with my doctor? I have recently been dropped from my insurance, so I am skeptical to pay for appointment that would have no solution if this is normal. Any advice would be appreciated.