Thanks for the query.
This presentation can be seen with many diseases. This is limited information to make precise recommendations. The best option is to consult a Dermatologist to understand the condition. A thorough evaluation if necessary should be done. A photograph of the affected area will help you get better recommendations. Hope it helps you.
Next Steps
Any fungal condition should be ruled out or it could be due to friction.
Health Tips
Your dermatologist will decide a treatment plan for you after a consultation.