Possibly a cyst, it would be best to consult a doctor.
...Again, I agree, could also be a "Calcium deposit", very harmless, yet I would still consult your doctor.
A rear end collision will cause your head to press against the headrest. You might also be pressed forward during this type of collision, but the first movement is against the headrest.
Some causes of painful urination can be a Urinary Tract Infection or possibly prostate problems. It is always good to see a doctor if painful urination persists.
See a dermatologist... You may just have a sensitive, discolored spot... but then again it could be something to keep an eye on for future reference... such as Neurofibromatosis...
Cystic Acne causes very deep, painful acne that can leave scars.
You ask if the Men's air pegasus is good against foot fatigue. Sadly, some of the wearers of this brand don't think so. It causes discomfort and painful foot problems.
on howrse its causes painful sores and scabs
Sulfuric acid.
what causes this to enlarge in the liver
yeast infection
Arthritis as well as chondromalacia.
swollen lymph node due to infection, usually in the head region.
Could be a tight foreskin, or something wrong internally. Painful erections should be looked at by a doctor.