Welcome to health care magic.
1.Generally post procedure status of the
cyst - might shows some oedema which looks like a cyst, as its still earl post procedure.
2.The other possible cause could be reoccurrence of the cyst again - which is also possible in few cases.
3.In case of reoccurrence - you need to wait till the stitches heal - and further monitor and plan for a minor surgical procedure.
4.Antibiotis are generally indicated after any procedure for better healing and as anti infective.
5.So at this moment - you need to take medication and let the area get healed first, then needs examination again after few weeks - if required a repeat procedure or minor surgery.
Good luck.
Hope i have answered your query,
any thing to ask ? do not hesitate to ask.
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