The relaxation response also seems to increase the available level of serotonin, which is a chemical in the body that positively affects emotions and thoughts. While this information is promising, more studies are needed to directly confirm the relationship between massage and levels of serotonin in the brain.
The most common cause of scrotal itch is skin lesions such as psoriasis and eczema, when people can scratch so intensely that they make the skin bleed. But these conditions are of course visible and you say there is no rash, so we must think again.
There are a few possible causes of this type of pain. One would be an inguinal hernia. A hernia occurs when abdominal contents (fat or intestines) bulge through a defect in the abdominal wall, usually in a downward direction toward the scrotum. If the hernia is large, you should notice a bulge in or above the right side of your scrotum when you are lifting heavy weights or bearing down.