Blebs are normal for skinny people. If they burst (spontaneous pneumothorax) your lung collapses. Given the circumstances they will remove the bleb and perform different types of surgeries. I don't know the names of them but I'll describe mine. They removed it and "glued" my lung in place with talc. I've had collapsed lungs on both sides, the surgeries on both sides. So both of mine are glued in. Now with your son there's really nothing you can do to prevent it. Learn the signs and hopefully it will never happen. Mine happened within 3 years. The first lung was in my sleep and 4:00 the next day I was passing in and out!! 95% collapsed. the second one I was watching tv, felt the pains got pale, went to bed. I knew what was wrong but I didn't want to go through the pain. It sealed on it's own and two days after the initial burst and collapsed at work. I was out for two months total. Learn the signs pains by your shoulder blades, shortness of breath, pale , and exhaustion. It can really happen to anyone but it's common with tall and skinny people with LONG arms especially. I hope this helped, good luck and god bless.