Based on what you have described, testicles can normally appear to change in size due to temperature, muscle contraction (cremasteric reflex), and body position. This alone is not a typical sign of testicular cancer. Finasteride can cause sexual side effects such as erectile dysfunction, reduced libido, and decreased ejaculate volume in some individuals, even within a short period. Since you have already been examined by a general surgeon and no concerning findings were noted, that is reassuring. However, if you notice a persistent painless hard lump in the testis, one testis becoming persistently enlarged, severe pain, or increasing swelling, you should consult a urologist promptly. If anxiety persists despite a normal examination, a scrotal ultrasound can provide reassurance and rule out significant pathology. Avoid relying on internet searches or AI alone for diagnosis, as they often list serious but uncommon conditions and can increase anxiety.

You you are worried too much about testicular cancer and you have doubts then get an Ultrasound of scrotum done it will rule out possibility of any testicular swelling

There is nothing to be of concern. Testicles feeling big or small at different times is just an erroneous conclusion. Fenestride does not cause testicular cancer. Please do not be anxious.