24 y/o female c/o vaginal discharge and "possible exposure t | Figure 1

Patient Case

24 y/o female c/o vaginal discharge and "possible exposure to STD." States she was previously tested in ED 1 week ago for vaginal itching and discharge and called to advise results were abnormal and to follow up with PCP but does not know results. States that incidentally has had rash for the past month that started on feet and has spread to legs, and is now starting to notice rash on back and proximal arms. Denies fever/chills, or any recent illness. Rash is not pruritic. Small red papules noted on bilateral lower extremities, proximal bilateral upper extremities, and lower back. Each papule has surrounding white halo approximately 1cm. No involvement of palms or soles. Any suggestions as to what rash could be?