Get it tested.
To be sure it is not genital herpes
, it would be wise to get this tested.
A smear/swab and tissue culture can make sure of the diagnosis. A tzank prep. Would show special cells called giant cells. However, if 3 doctors were not convinced, you might want to just wait a while. Genital herpes has other symptoms, like discharege, and swelling of the lymph nodes of the pelvis so be sure.