I've developed a rash which started in the groin area, then two weeks later started on my upper chest, working it's way up my neck to my sideburns, and now all over (going on 3 weeks). Some fine pimples developing along with some brown spots. What STD's would have them symptons? We tested for C Trach, Gonerrhoea, Sphypllis, and HSV at week 2 post incident. All negative. Retesting Sphyillis since it was done in the 2 week time frame.