It is highly unlikely that you are having herpes genitalis. Your problem may be that of balanoposthitis. It has a number of causes. Washing the genitals with antiseptics, soaps, etc may also lead to this. Candidal infection may be the cause in those whose partner has vaginal candidiasis or they are diabetic. Trichomoniasis may be another cause. Allergic rashes may even develop from latex condom being used. Consult a good dermatologist to find your cause and treat accordingly.