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.
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
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.
The love knot is made from a single piece of soapstone and depict the flow of two becoming one. It signifies unity, harmony and love.
You can use "do not" in its full form, or in its abbreviated form as "don't".
Only a doctor can diagnose headache patients. For appropriate diagnosis and treatment advice, seek the help of a physician or headache specialist.