My boyfriend has a rash on his penis. i had a yeast infection & took fluconizol. i gave him one & him went away. but now it's back.

Not so simple: Vaginal yeast is not an "infection". It is a proliferation of yeast which is already present in small numbers. The yeast proliferates because of sugars in the environment or because there is a loss of normal bacteria. The most common cause is exposure to antibiotics which kill the bacteria normally competing with yeasts. There are a variety of rashes on the penis. Is he circumcised? Frequently th