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.
A knot in timber is caused by the presence of a tree branch or limb that has grown from the trunk. When the tree grows, the wood around the branch forms a knot as the branch's growth pattern differs from that of the surrounding trunk. This results in a denser area in the wood, which can affect the timber's strength and appearance. Knots can vary in size, shape, and quality, influencing the wood's suitability for various applications.
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.
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.