There is no fast way. A cold sore is caused by the herpes simplex virus and goes away with time. An over the counter treatment usually helps some, but if you pick at it or try to scrub it off you may spread it or it can become infected.
Only if the toy touched the cold sore in some way, and then touched the other child's mouth. yes
Abrvia
the fastest way to get rid of greasy hair is to put baby powder in it. This sounds weird but the baby powder absorbs the oils.
The fastest way to get rid of a cold sore (that I have found) is to take about five matches, light them, blow them out, then dip them in water. Pinch the wet sulfur and rub it between your fingers. Pop the cold sores somehow (I useally pick them with my finger nails or a needle) Applly the wet sulfur like lip gloss. wait at LEAST 2 hours, wash off the sulfur with alcahol or proxide, apply bagbalmor yourbasic anaceptic ointment, leave on overnight (If the anticeptic oinment does not heal the wound over night repeat agian the next night.
Carmex
Install anti-virus software and it will automatically get rid of the virus.
Just gain weight.
conduction
by leaking sweet but the best way is to take some sore throat medicine like strepsils
Cold water
Find someone who has a cold and ask them to cough in your face.
jus leave her.......dont talk to her, ignore her