well, if ti was an allergic reaction it would have started imediatly upon using it, correct? Just a thought, but did you change your viatmin intake? Are you consuming a larger amount of niacin? That would cause a tingling.
Perhaps check your BP. If it feels tingly it may be a slight raise due to the fina. Do your cheeks get a little red maybe? Where do you feel the tingling? Perhaps your skin is getting a little dry, causeing itching. Are you noticing any flaking?