hmm.. i was going to say something like lipoma but it seems that the ganglion cyst looks very similar to ur hands... then i dont think it will disappear over time, u'll have to remove it surgically. if it doesnt interfere with ur life and work, and u're scared of surgery, then u could just leave it like that. but it's still best to go for a checkup. dont worry, the doctor wont force u to remove it or anything, the decision is up to u. just go and see what his opinions are.

wow, u really followed the method? how hard did u hit ur own hand to make it disappear? good for u bro!