It is difficult to comment with so little information. If you are worried see your local Doctor.
7 mm is about a quarter inch and 3 mm about an eighth of an inch.
It is probaly a infection. You should see a doctor.
just to let you lnow, a dime is worth ten cents!
A dime sized hole.
Burr hole
Herpes Zougust
It sounds like a cyst but you should have doctor check it to be safe. I hope you have a nice evening.
Dime sized bolts.
Go to the doctors
Not sure if this is the same as your case, but I had one when I was young andit was just a calcium deposit.
It depends on what you mean by "dime sized". If it's a miniature version of a quarter with a complete image on both side, it's not a real coin; it's a novelty item with no special value. If it has part of the normal-sized image of a quarter on it, you may have what's called a "wrong planchet" error. It happened when a dime blank (planchet) accidentally got mixed in with the blanks intended for quarters and was struck with a quarter's image. If you think you have a wrong planchet error you should have it inspected in person by a dealer who is familiar with error coins.
Blow dry hair. Add dime sized amount of wax. Tousle.