Can i put lotromin on the tip of my penis?

You can use Lotrimin on the tip of your penis as long as you are using it for a fungal infection. Fungal infections like yeast (Candida) tend to be pretty rare in men unless you are uncircumcised. In general any medication should be used for the intended purpose so be sure someone has made a diagnosis

If you feel you have a yeast infection you could try a course of lotrimin every night for 7 days. . Be advised that yeast infections can be passed back&forth between sexual partners unless both are treated for yeast infections. See your physician as needed.