weird cyst on my pubic area???

so i have this puss-filled cyst on my pubic area that grows and eventually pops like once a month, then it shrinks completely and the cycle repeats. has this happened to anyone before? if so, what the heck is it?? i’ve been to my doctor but she doesnt know what it is exactly so she made me do an ultrasound ON the cyst itself and these were the results.

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