<s>[INST] Hello doc, My boyfriend has a swollen scrotum, he went to the hospital and the doctors confirmed fluid in the scrotum and they performed a surgery and the fluid was removed on the 22/102018. Until last week, there seemed to be improvement but Sunday he complained that the swelling had started again. One side What could be the problem! Please help. [/INST] Hi, If the fluid drain is the procedure done, it is not a permanent cure for hydrocele. Eversion of the sac is the procedure can be a permeant cure. If the operation of eversion of the sac was already done, it can be due to infection. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. S.R.Raveendran, Sexologist </s>