Most likely from infection. Your lymph nodes can do some impressive things though so keep a eye on it but don't over handle it either. Touching it all the time can make it worse by irritating the sesitive node.
The difference between ultraviolet radiation and ultrasound is how they react when inside the body. Ultraviolet radiation attacks the cells and destroys cells that are harmful to the body. Ultrasound is merely a viewing device. Ultrasound is used to detect abnormalities in the body.
Ultrasound.
Difference is in their frequency, audible sound waves is between 12 Hz and 20,000 Hz, Ultrasound waves is any sound that has a frequency beyond the 20,000 Hz limit
sonar is used to detect big penises
Ulrasound is sound that is too high pitched for the human ear to hear. Ultrasonic is used to describe a sound as being an ultrasound. So, ultrasonic is an adjective, and ultrasound is a verb.
Infrasound has a frequency below normal hearing. Ultrasound waves have a frequency above the normal range of human hearing.
The difference between papilloma tumors and papilloma skin tumors is that papilloma tumors are not cancerous. Papilloma skin tumors have the ability to become cancerous over time.
The difference is that the first is unconfirmed, while the second one is assume to be confirmed.
"A regular ultrasound is usually a permamently installed piece of medical equipment installed in a doctor's office or a medical provider's facility. A portable ultrasound is an ultrasound that can be carried from one location to another. Portable ultraounds can be particularly useful for treating large animals, for use in remote areas, or for diagnosing the homebound."
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A hypothesis is a suggestion of a way to explain something. If the hypothesis is tested and confirmed, it can advance to the status of theory. The conclusion of testing a hypothesis will be either that the hypothesis is confirmed, or it is not confirmed.
There really is not much of a difference between unofficial and non-official. They both mean non confirmed and non formal.