Hi there. I empathise with your worry & your predicament. In my professional opinion from the facts supplied, it is NOT herpes
. It is more likely candidal (fungal) balanitis
& it is more likely than not that your girlfriend has recurrent fungal infection
issues as is common in women. It is best to get both partners treated simultaneously. Also if you still are concerned at the back of your head it is herpes, then please do a blood test
for herpes 1 & 2 (ask for IgG & IgM herpes testing)..the former will tell you if recent & the latter if long standing infection & are more sensitive. Life will soon be peachy again ;-) Cheers & good luck to you both. Should you wish further details or private consults, feel free to look me up on this portal & use the special 'ask-a-doctor' feature for a one-to-one consult.
Dr Praveen Rodrigues MD Dermatologist
, Cosmetologist, Venereologist, Vikram Hospital, Bangalore