your testicle probably had a negative reaction to something. from my perspective its nothing serious but i would recommended that you visit your local doctor and get it looked at.
what could possible cause a scab/sore formation on the lower left hands side of the testicle. i was working out over the week and when i took a shower tueday night felt a small bumb on my left testicle i have a slight burning / itching feeling around the sore as well at first i thought it was just jock itch but now i am not sure its seems to have got better over the past few days but i wanted to make sure it was nothing i need to go to the hospital over i also have been appliing diaper rash cream to the area wich seems to have helped the sore isnt very big ethier