I have gotten those on occasion and think they are from shampoo or hair products left behind the ear. I clean the area with alcohol and try to remember to rinse really well behind the ear. Fluid will sometimes come out of them and I push the rest out.
A knot forms in wood when a branch or limb grows out of the tree trunk, causing a concentration of grain and density in that area.
It can be, its called a subdural hematoma - you might want a doctor to take a look.
The plural form of knot would be: knots
The plural form of knot would be: knots
You may have a blood clot if your vein is swollen and is forming a knot. It is important to have that checked out since a blood clot can go to your heart and cause severe damage.
A hernia
The word knot can be a noun or a verb. The noun form is a looping of rope or other material so that it cannot be untangled without passing the ends of material through the loops. The verb form means to form or tie a knot.
figure eight
When a knot is pulled in a rope, the tension applied causes the rope fibers to press against each other, increasing friction and making the knot tighter.
The bowline is used to form a loop large enough to sit in. The "tied-off" end can be any knot that will not slip.
To create an adjustable length knot for a necklace, you can use a sliding knot technique. This involves creating a loop with the necklace cord and then passing the ends through the loop to form a knot that can be adjusted to change the length of the necklace.
A knot in the stomach may be a feeling of tightness or pain. See a doctor to make sure this is not a hernia or any other condition needing attention.