maybe a cyst
Infections causes it to swell
pericadium
Tonsillitis
asthma
It softens and causes the hair to swell
No
MUMPS
No.
water on the knee, torn cartilage, arthritis, these are just a few of the causes.
A hypotonic solution, with a lower solute concentration compared to the inside of the cell, causes water to move into the cell via osmosis. This influx of water makes the cell swell and potentially burst if the osmotic pressure becomes too high.
hypertonic solution
lack of water