It is unhealthy to avoid ejaculating for long periods of time. It's generally considered healthy to ejaculate everyday (or at least once a week).
Hi,
How are you? What are the symptoms present? Testicular cysts may be attributed to a variety of issues such as spermatocele, epididymitis, orchitis or inflammation of the testicle, hydrocele, varicocele, or hernia. Epididymitis or inflammation of the epididymis which stores and transports sperm may be caused by infection or abnormal flow of urine into the epididymis. Avoidance of ejaculation may be a factor but not necessarily the cause of the cyst. Take care and best regards.