How can I effectively treat and prevent heat rash around my ankles?

To effectively treat and prevent heat rash around your ankles, keep the affected area clean and dry, wear loose-fitting clothing, and avoid excessive heat and sweating. Use calamine lotion or hydrocortisone cream to soothe the rash, and try to stay in cool, well-ventilated areas. If the rash persists or worsens, consult a healthcare professional for further treatment options.