There was slight genital rash developed more than a month ago. I took medicines (antibiotics) and did STS test after 6 weeks from observation of this rash (prescribed by Dermatologist) . Results were non-reactive. I was applying neomycin ointment. At 8th week it turned very red and spread a bit. I did full STD panel test (RPR, TPHA,  HSV 1,2, Chlamyida, HIV) and all results came out negative. This is not going . Can someone help .(image attached)