I Have Been Experiencing A Prickling Sensation On My Skin

I have been experiencing a prickling sensation on my skin - outside thigh. It's not painful. He'd to describe. A "prickling" sensation . . . tiny pin prick type of sensation over approximately 1/2 of my thigh. No rash. It lasts for about 1/2 hour or so, but it varies. It happens anywhere from 3-5 times per day. I have no health issues other than borderline high blood pressure, for which I take enalapril. I am not experiencing any other symptoms. I wouldn't normally be too concerned but it has persistent for several weeks. Should I be concerned?