I think i have an std. Serious answers please :(?

it started last night i went out raping sheep when suddenly it turned around and spat on my nob, so i punched it in the . I stopped the ual ault and went to wipe the spit away when i noticed this kind of burning sensation around my , so i checked and found a scab which had started to form just above my foreskin, ripped it off but its now bigger. What can this be???!!!! :( is it some type of side effect from the s?