Am I using the wrong product? Should I consult a doctor?

It is possible that you are using the wrong product for treating the skin condition. Consulting a doctor may be a good idea to get a proper diagnosis and recommendation for treatment. If the issue is a fungal infection, using an antifungal cream like Clotrimazole can be effective. It's important to apply the cream twice a day and keep the affected area as dry as possible. Additionally, using a barrier cream like Penaten can help prevent irritation from friction. It may also be helpful to let the affected area be diaper-free for short periods to promote dryness. Following these steps should help improve the condition within a few days. If you have any more questions or need further clarification, feel free to ask.