Thanks for posting your query.
Sagging and hanging of scrotal sack is not a disease, it is perfectly normal to have such sack. In warm season, warm clothing or during working hour scrotum
tend to be lax and when you bath it would shrink to tight ball. Lopsided feel of testes is also okay. The bumps seem most likely related to local infection like papillomas or they may be sebaceous cysts or furuncles
A visit to a local physician would be further helpful.
I hope this answers your query.
In case you have any follow up queries or doubts, you can forward them for me, and I shall be glad to help you.
Please accept my answer in case you do not have further queries.
Wishing you good health.