I just noticed that both my inguinal lymph nodes are tender on palpation . It worries me because i also have noticed a small pimple on the shaft of my penis, i usually get acne on my penis, but with the tender inguinal lymph nodes as well, its getting me quite worried. I had sex about a month ago with a stranger, could it be that i might have picked up an STD ??? please help, im really concerned and worried