Hi, You seem to have developed fungal infection. Fungal infection is usually itchy. It favors sites like inner thighs, groin and other body folds like axilla, sub mammary folds etc as patches and rings with redness, scaling and darkening of skin. Moisture from sweat and warmth of body folds encourages the fungus to grow. I suggest you to take an oral anti-fungal like e.g either Fluconazole or Itraconazole along with the application of a topical anti-fungal cream e.g either Luliconazole 1% cream or Terbinafine 1% cream, twice daily for 2-4 weeks. In addition I also suggest you to take an oral antihistamine e.g Tab Cetrizine once a day for symptomatic relief from itching. Hope I have answered your query. Let me know if I can assist you further.