By a gerbil or rat, put some butter on the wart... problem solved. Actually, like it is said above. It is upto you (and it REALLY depends on the kind of wart), much of it is cosmetic. HOWEVER, if it is red, iritated, or anything of the sort SEE A DERMATOLOGIST IMMEDIATLEY!!! It may just be an infection, or it maybe something worse (not to worry, but cancerous, etc). Very rare, but why take chances??? If it is just a normal run of the mill wart that isn't bothering you, maybe it will go away for awhile, but you can always see a derm to take care of it and do it safely plus make sure it isn't something else.