Hi there.
Kindly post some clear digital pics 📥 and a more detailed description of the rash together with this, will help us make a pucca diagnosis.
Given this appears an acute problem and you wish for an early cure ASAP, do consider connecting via this App's INSTANT ONLINE Consultation 🙏
It appears (going by your description) it is some sort of an infection likely fungal. This can be easily sorted and a prescription provided.
Health Tips
Avoid OTC products, home remedies, self medication and Dr Google suggestions 🙏
Treatment of contacts and partners and some lab 🧪🧫 tests may be required once pics are viewed and diagnosis established.
Treatment of Fomites also imperative.