Greetings, My 24 yr old son will be going to Japan in the fall as an exchange student. Just went for physical.MD said chest xray had some areas if calcifications ,and needed a tb skin for a follow up. My son has always been healthy..chronic allergies,over weight,sedentary life style. None of the signs/symproms of tb..is this just a routine physical thing or should I be further concerned...He is finishing up his fourth year at University studying Japanese,has several Japanese in his class and as instructors. I know tb is found in citizens of foreign countries.