Strange Pimple-like bump on head of penis. Got checked but said I'm fine?

I recently had this pimple-like bump appear on the head of my penis about 2 weeks ago. I immediately went to get checked and was told I am probably fine and shouldn't worry. Well it's still there and it's concerning me, I was told it was probably due to change in body wash but that just seems too simple to me. I tend to over worry when it comes to STD's and even though I was told I'm okay I just can't get over it. I've looked into symptoms for Herpes and it doesn't seem to look anything like that, but I think I have some of the symptoms such as nausea, headaches, and possibly a tingling sensation but I tend to assume the worse and don't know if I'm just working myself up or not. I don't know what to think, I was told it should be nothing to worry about but I just can't shake the feeling that I should be worried. Anyone have similar experiences or advice?

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I have responded to your other forum post here:
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