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.
Quick Answer. The age at which people grow armpit hair varies, but for boys it is often between the ages of nine and 14. Girls typically begin to grow this hair between eight and 13 years of age. Keep Learning.
Cysts and infections of the skin of the armpit may be caused by shaving or use of antiperspirants (not deodorants). This is most often seen in teens just beginning to shave. Abscesses under the skin may also produce large, painful lumps in the armpit. Other causes of armpit lumps may include: 1  AIDS. 2  Arm or breast infection.3  Cat scratch disease. 4  Cancers such as lymphoma or breast cancer.5  Chickenpox.6  Infectious mononucleosis. 7  Lipomas (harmless fatty growths).his is most often seen in teens just beginning to shave. Abscesses under the skin may also produce large, painful lumps in the armpit. Other causes of armpit lumps may include: 1  AIDS. 2  Arm or breast infection. 3  Cat scratch disease.