It could be as simple as lymphadenopathy associated with a viral infection, or as complex as multiple lymph node involvement from one of a variety of lymphomas. The fact that these are painless is a bit concerning. So, to be on the safe side, it would be prudent to have her obtain a scheduled appointment with her physician to assess the situation.
It shouldn't hurt, if it hurts the muscle is not warm yet. When it will be warm, you will see the same stretch will be painless.
Tht is coz of muscle spasm the muscle tighten coz of exersion
antagonist muscle
Muscle strain
An abdominoscrotal muscle is another name for the cremaster muscle, a thin muscle attached to the testicles.
when one muscle is against and opposes another muscle
synergistic muscle
straited muscle are another form of skeletal muscle.
It is called involuntary muscle or smooth muscle.
Im a med student. I am NOT a pro yet. but here is a possibility: a hematoma (blood pocket). You say no trauma, but do you play sports? racket sports and basketball (where there is lots of changing of direction) can cause muscle tears which may allow bleeding into muscle, within the fascia. This results in a localized swelling which can be painless. The hematoma will last long after the muscle seems to be fine, as the blood lump will take a long time to be broken down. You dont need to have blunt force trauma to area for this to happen. I recommend you see a doc though, I don't have a medical license, and I haven't examined you. They may send you for an ultrasound (the most painless and noninvasive test in existence) to see what is inside.
This is muscle tissue that you have to think to make it move. Another name for it is skeletal muscle.
A antagonist muscle is a muscle that opposes the action of another muscle. The Triceps Brachii is the antagonist of the Biceps Brachii.