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Hello. How long have you had this rash? Does it itch or burn?
Based on your description, the location, and your pictures this would most likely be a fungal rash (i.e. tinea cruris). The fungus likes warm, moist areas such as the groin. Keeping the area clean (with mild soap only) and dry (pat dry, don't rub) and hitting it with an antifungal cream (e.g. miconazole, clotrimazole) twice daily for 3-4 weeks should eliminate the fungal spores and hyphae and lead to resolution. If the rash were to worsen, have it examined by a nurse or doctor in person to confirm the diagnosis and make sure there are no complicating factors causing it to persist.