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1.You have palpated and felt a soft lumpy feeling in the scrotal sac.
2.Possibilly you are feeling the chord or
epididymis as a soft lump. Since you are not symptomatic i don't think there is some thing abnormality.
3.In this case you get it examined by any doctor, who will be better in assessment.
4.The investigation of choice in this case will be
ultrasound scrotum, ultrasound will help testicular parenchyma, chord,epididymis,presence of any free fluid and weather there is any lump or not.
5.In this case let doctor examined, if you are not satisfied request for the scan - that will clear all your doubts. Get an appointment and followup.
Good luck.
Hope i have answered your query,
any thing to ask do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888