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The cyst in the ultrasound
needs to be differentiated to see if it is benign or haemorrhagic cyst ;also whether you have pain or no is important.Please consult a Urologist
and get examined.He will prescribe the needed medicines and if it is a simple cyst
it may reduce in size or resolve completely in 2-3 weeks but if it does not then the Urologist will tell you regarding further management.