I have a 5 year old grandson who I noticed the other day having a somewhat bulging carotid artery. He was being funny and was trying to belch and was causing his face to turn red. I noticed his left carotid artery bulge out and be very noticeable. I had him to relax and the artery went down but it was still noticeable. He is a slender little boy. I was not sure if I should mention this to his mother or not. I didn't want to alarm her for no reason. Should I tell his parents about this and see about having his pediatrician look at this? He hasn't been sick with a cold or bronchitis and he has no history of asthma.