Also, Doppler can detect abnormal blood flow within the heart, which can indicate a problem with one or more of the heart's four valves. Color Doppler. Color Doppler is an enhanced form of Doppler echocardiography. With color Doppler, different colors are used to designate the direction of blood flow.
(I got armpit hair around 11 1/2 but everyone is different) From around age 13-16 but it can still happen earlier or later (maybe even 12 and 19) got mine just before i turned 14. Brent Lyday.
Teenage Acne in Boys. During puberty, a boy's skin on his face, neck, back and chest will eventually begin to overproduce a type of oil called sebum.Sebum is normally a good substance -- it keeps the skin waterproof and fends off harmful bacteria.But too much is definitely not a good thing.eenage Acne in Boys. During puberty, a boy's skin on his face, neck, back and chest will eventually begin to overproduce a type of oil called sebum.