why my testicles one is bigger than one?

Testicular swelling treatment:
First of all, you should see a doctor to evaluate your condition, determine the cause of the swelling and then treat it according to the diagnosis. Torsion in the testicle must be excluded. If there is an an inguinal hernia, which may extend into the testicle causing swelling, it will be treated surgically. If there is hydrocele, the treatment will also be surgically. Furthermore, testicular tumors should be excluded.

Diagnosis:
Clinical examination and knowledge of the your medical history by the doctor, complete blood analysis to detect the presence of infections represented by high white blood cells, urine analysis to detect infections, testicular ultrasound, in addition to taking a sample of the testicle if there is tumor.

Causes of swollen testicles:

• Hydrocele
• inguinal hernia
• testicular torsion
• orchitis
• Varicocele
• testicular tumor
• spermatocele
• other reasons

Recommendation:
It's recommended to urologist for further assessment and management.