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.
Causes of painful scrotal swelling include torsion of the testis and its appendages, epididymitis, orchitis, incarcerated hernia, infarcted germ cell tumour, scrotal cellulites, and trauma. Our patient's swelling was self induced. Scrotal cellulitis as a complication of infusion of saline in a 37 year old man has previously been reported but his HIV status was not given. Gaseous inflation of the scrotum causing scrotal emphysema has also been recognised.