Beware any dermatitis or inflammation on either of your index fingers. On entering the USA you'll be required to provide index finger prints as part of your proof of identity and if the skin of your finger tip is inflamed you may well inadvertently fail this test. At best this means a significant delay at Homeland Security Department. If possible check your index fingers a week, or more if there's an obvious problem, before travel and get some medical treatment to ease your journey!
