I'm a 20 year old female concerned about catching something after having a man (of unknown status) ejaculate in my mouth twice.
Five days after, I woke up with a swollen/sore throat and red, sunburn-like rash covering my groin, buttocks, breasts & surrounding area, but it didn't itch and I no fever. I had slept with a tampon in, and was concerned about TSS, but had no other symptoms. I went to the hospital the next day, as the rash had spread to my hips, underarms, and inner arms (again, red, macupapular). Doctor did a CBC and told me that I was negative for mono, said I didn't have strep (although I'm not sure where this came from, she did not perform a swab test), and that it was probably a virus and the rash should disappear in the next day or two. The rash improved a bit, but began prickling in the heat/sun the next day, and spread to my thighs. The next day, it appeared on my knees and feet, although the rash on my feet was sort of a pinkish blotch (about 2" across), with a redder outline.
I went to a different doctor, who took a look at my throat (now severely inflamed/infected, tonsils *****), swollen lymph nodes, and rash, and told me that I had scarlet fever. He didn't perform any tests, but prescribed amoxicillin. I took it at night, and woke up in the morning with a throat feeling slightly better, but with rashes on my feet (around where the previous blotch had been---that area is now clear), on my hands (both the backs and the palms; red dots that aren't raised and are about 1-2mm, coming together to form red patches where some of my fingers meet my palm), around my shoulders, and on my upper back. These are all places where I had not previously had rashes, and these were more itchy, and became progressively moreso throughout the day.
I read that amoxicillin can cause rash in people who have mono, and was concerned that I didn't really have strep (or that I had both strep and mono). I went again to the second doctor, who was a bit perplexed, but said that I couldn't have mono, and that if I was reacting to the amoxicillin I would have a swollen mouth as well. He told me it was probably still scarlet fever and that I should continue with the antibiotics and let him know if it worsens by tomorrow. Right now, it's sort of appearing on my outer arms (spreading up from hands), and also up my legs (from ankles). This rash is slightly different from the original one, in that the spots are larger, and while raised slightly, not as much as the original rash.
I'm wondering if it's possible that this is due to an STD or I (possibly syphilis?) and if so, which one. Thanks!