<s>[INST] I had a knot on my 2nd toe at the joint below the nail. It looked like it had a center with a round circle on top of the knot. I mashed on it and a clear sac came out filled with clear fluid in it. A round little sac with clear fluid and left a hole in the knot [/INST] Hello dearWarm  welcome to Healthcaremagic.comI have evaluated your query in details  .*  This seems in relation with bursa cyst or sebaceous cyst .*  Needs to be confirmed with physical examination or at least a photo pic    evaluation as an attachment  to give more precise  judgement .Wishing you fine recovery .Feel  free  to ask any further doubts .Regards  . </s>