Recurring issues at Genetial Area.

I had an exposure with sex worker in the month of october 16 and in the month of december 16 i started facing itching and perpetuial cracking and for which a dermatologist has diagnosed with some candid. i was relieved after 10 days of medication. during that ive undergone test for HBSAG, HIV 1&2 and Hepatitis b & c. All the reports were normal. Again in the month of April 17 i ve again faced some itching and found some red spots on internal penis shaft. ive immediately undergone test for HIV 1&2 and HSV 1&2 and sugar test. all the reports were normal. But a dermatolgist has given me gential herpes treatment another dermatalogist has told me some fungal reaction. ive approcahed a ayurvedic doctorand he as well told me it is fungal. I am going through all the treatments but i am not coming out of this. Can any one help me out in finding what exactly iam going through. Now i see some dark spots on the external penis shaft skin and its surroundings.