Well, without a clinical evaluation it would be difficult to determine the cause of the testicular. Possibilities that may need to be considered include infections/ inflammations of the testis or epididymis, growths/ masses such as hydrocoele, hernia, cancer etc. The diarrhea is likely to be due to a GI infections/ inflammation etc. I would suggest considering a clinical evaluation by a primary care physician initially and depending on the cause diagnosed/ suspected, it can be managed accordingly or specialist care may be sought.
Hope this helps.
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