The INFECTION of the cyst may be cleared up with the ABX, but the cyst itself is certainly still there. I am not aware of cysts spontaneously vanishing.
This may be cause for future reinfection. Look up some online info about how to care for an existing cyst so as to avoid the possibility of future infections. Keeping the area as clean as possible is an obvious good way to start... but it's an awfully hard area to keep free of bacteria -- pretty impossible, actually. But there are things you can do, so ask your doc and/or look online.
If the cyst is between your butt cheeks or located directly on or to one side of your tailbone, this can be a very bothersome type of cyst called a pilonidal cyst. It can get very complex dealing with this kind of cyst and assessing treatment options, but no need to get into that right now. Pilonidal cysts are almost ALWAYS on the tailbone, but they can develop channels that drain into areas between the butt cheeks, which is why I think it merits some consideration. Most GPs can diagnose one of these easily enough, but you need to discuss treatment with a surgeon or a colo-rectal specialist.
Thought you should have a heads up here -- these cysts are sometimes undiagnosed for long periods of time. But if it was "just" a "regular" type cyst -- you should be good to go.
Good luck.
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