Hi... This looks like a patch which happened after an itchy rash or application of heat or irritant cream. Try Clearz Max cream at night to dark patch for 2 weeks. This cream may sting on application..but you will get used to it.
Next Steps
you can contact me for a follow up after two weeks. this can.be via practo or my clinic in Mumbai.
Health Tips
do not expose the area to direct sunlight.