Dear sir,
Thank you for your query at DoctorSpring.com
You should certainly get examined and investigated with urinalysis and ultrasound scrotum. I don't expect anything major but still investigations are desirable to rule out minor problem.
You should use scrotal support so that testis stays elevated. Your pain as well as redness shall decrease.
You can have varicocele or epididymitis.
Varicocele is dilation of the testicular veins and leads to pain in testis, worsening of semen quality and testicular atrophy.
Epididymitis is inflammation of epididymis. It causes pain, redness and treatment is with antibiotics.

Take care
Sincerely
Rajiv Goel