The data you provided (sore testicles, red and itchy scrotum) does not clearly indicate whether you have a genital infection affecting the testicles or the skin of the scrotum is affected by an infection and the pain is felt falsely in the testicles. Additionally, infection from the testicles might, in rare cases, spread to the scrotal skin and vice versa.
Genital infection affecting the testicles might be characterized with presence of pus in the sperm, changing its consistency and smell.
Visiting a urologist or a dermatologist for a physical examination and sperm culture might be enough for a definitive diagnosis to be given. Antibiotics pills might be recommended. Additionally, antibiotic creams might be applied if a scrotal infection is detected.
Both infections (genital or skin in genital area) might be transmitted from a sexual partner. Therefore, if any of the mentioned conditions are diagnosed, treatment for you and your partner at the same time is highly recommended.
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