Thanks for writing your query.
After reading your post, it seems that your rash seems to be due to dermatitis
You can take antihistaminic like Levocetrizine 5 mg once a day.
Also apply locally skin cream containing antifungal like miconazole, antbiotic like gentamycin
and a steroid like betamethasone
. You can repeat this application 3-4 times a day on the rash.
If the problem persists, get yourself examined clinically by a Dermatologist
I hope this is helpful to you.