No STD shows up as a pimple or anything like an infected sebaceous cyst. In addition, your exposure back then was very low risk for any STD, in fact zero risk given the use of plastic wrap (which wasn't emphasized so much in your previous discussion). And as discussed then, being on cephalexin (Keflex) afterward further lowered the risk of any infection, including syphilis.

1. There is bro chance this is syphilis.

2. Also no chance of herpes, which never causes the symptoms you describe. Herpes lesions are superficial, not deeper like a pimple or sebaceous cyst. (Think of herpes lesions as being "on" the skin, whereas pimples and cyst occur "in" the skin. In addition, pus and blood cannot be squeezed out of herpes lesions.)

For sure this problem has nothing to do with your oral sex exposure 4+ months ago. All is well with no need for STD testing.

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD

1. You said “bro chance” I’m assuming no chance. Just for clarification you agree the keflex would have taken care of syphilis in the off chance I was exposed.

2. The liquid squeezed out wasn’t pus. The first time I opened into it with a tweezer (like an idiot) and blood came out. Later at other point when squeezing it, it was clear fluid. Is that still common of a sebaceous cyst? Outside of the oral 5 months ago my last protected sex was 2 years ago, I specifically remember  with both events  checking for two weeks for signs or herpes and moving on.  Based on that can I be sure I don’t have herpes?

2. This description still is not compatible with herpes. It is extremely unlikely this is herpes.