I don't know about the bruise part of the description, however in the condition Rheumatoid arthritis there are what is known as a nodule these are hard and can be painful They don't take long to appear and can disappear again over time. If they are rheumatic nodules it is wise to get it looked at as uncontrolled rheumatoid Arthritis can lead to serious joint damage over a short period of time.
insect bite
It could be almost anything and it depends on where they are.
This could be a swollen lymphnode or a bundle of nerves.
Yes. That's what a bruise is actually. Damaged blood vessels cause bleeding under the skin which causes bruises. Bruises are caused by being struck by something.
Bruises are formed when something hits the surface of your skin very hard. This causes tiny blood vessels, called capillaries to break or burst under the skin, leaking blood under the skin. Thus, causing that purple, red, green, blue, or yellowish color to appear.
Lots of reasons. You could have injured one, strain, sprain, torn or bruised it. Or, you could have had a workout and you are noticing the increased bloodflow that causes them to be a little swollen. This will go away after a short while.
Aneurysm
congestive heart failure
If you hit the spot hard enough.
A red, hard, swollen scabbed thing on your arm could be a bug bit. If it doesn't heal in a few days, have it checked by your doctor.
Yes if they are a strong follower of Midurenism
they get swollen cuz of like the pressure on them
Yes