I am worried about std

Patient: Hello doctorI am had this problem in January 2015And now it returned backThere is an itchy skin on the base of the penis( where the penis meets the pubis)And I also saw some dandruff kind of white stuff around the area but this is only if I don’t wash it even if it is itchy and now I don’t know what shall I do. And I am very scared.I m sexually active .

Symptoms: Itchy skin and dandruff like stuff