Worried i have herpies

Patient: I have a large red lump on the base of my penis by my scrotum that has blisters…well just one that was watery looking then one today that is white like a little small whitehead..the lump was small and seems to be getting bigger and moving randomly…first night it stung really bad and ive had painfull urination since…i got it i noticed right after i had anal sex with my girlfriend with no condom…

Symptoms: Pain during urination and burning in the lump