Such rashes can occur in syphilis, seborrheic dermatitis
, pityriasis rosea
, fungal infection
, due to some drug intake etc. The best way to rule out syphilis is to get VDRL in dilution done. Skin rash in syphilis in almost all cases is preceded by a genital ulcer
.Even if the results are positive, it is completely curable. So there is nothing to worry. However till the time you do not get your reports, do not indulge in intimate physical contact as it is a highly contagious disease. Consult a dermatologist
to get these possibilities ruled out as once a diagnosis is made, an appropriate treatment can be instituted. Take care.