While Vicks VapoRub contains ingredients like menthol that offer a temporary cooling sensation, it is far too harsh for the sensitive skin in that area and can cause severe burning and irritation. Since jock itch is a fungal infection, it is best treated with a gentle, over-the-counter generic antifungal cream, such as clotrimazole or miconazole. Applying this safely clears the fungus. Please keep the area clean and dry, and reach out to a doctor if you don't see improvement.