White pimple by penis tip/urethra?

Patient : I have a what looks like awith pimple on the tip of my penis/urethra. I am 17 sexually active and only had sex withmy exgirlfriend around june-july. I did use protection and after a couple of days i had no problems or any signs if infection whats so ever its been 4-5 months now and i still had no problems until yesterday after a shower i accidentally applied shampoo+condioner on my penis. It had a dispenser so ithought it was lotion and i just went to sleep right after that. I wake up having this intense burning sensation down there only to find out what i applied was shampoo. The urethra opening is swollen and the "pimple" wasnt there yesterday. However It does hurt when i pee, but the pimple serms like a regular size pimple. Could i have had an infection since june and the shampoo made it show its self? I had no problems or pain before whats so ever. I have also been hospitalized in september as i just found out i have addison's disease, but im not sure if they tested for stds, but i think they tested hepatitis. Plz help as i do not want to let down my parents, but if i have to i will.
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