In medicine a venereal or sexually transmitted diseases (STD) is an infective disease which is transmitted by direct infection during sexual activities, including oral and anal intercourses. Most of STDs are initially asymptomatic , this contributes to the high risk of transmission to other persons. . The symptoms include vaginal or penile bleed, ulcers on genitalia and pelvic pain.
The Italian Ministry of Health has a dedicated website to give useful information on it. In any case the most important advice is to see a doctor immediately to assess the case. http://www.salute.gov.it/portale/salute/p1_4.jsp?lingua=italiano&area=Malattie_sessualmente_trasmissibili