ok, so i started to notice sebaceous prominence on my penis about 6 months ago. (im sixteen years old, have had pubic hair on my penis for about a year and a half, and i am starting to grow thin facial hair and underarm hair.) about a month ago, i noticed 1 sebaceous prominence spot on the left side of the shaft that was a little bigger than the others. 4 days ago, a red smooth red bump started to grow under it. the next day, there appeared to be a whitehead pimple there. the day after that (2 days ago) it became a little sore when you pressed down on it. (exactly like a pimple on the face feels) then, yesterday when i woke up, it looked like the white part of the white head fell off, and there was a little dimple on the top of the pimple-ish bump. it freaked me out because it kind of looked like the pictures of primary syphilis i have seen. but its not very big at all. i just measured it and the rim of the depression is only about a 1/16th of an inch wide. today the redness started to go away, but the crater is still there. it kind of looks like a small, less irritated version of this, which i read was a boil:
and now i dont see the original sebaceous prominence that was there before the red bump appeared. So am i just overreacting, and could it just be something puberty has caused?