Which fungal infection causes itching and red rashes throughout the body?

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I read your query and understand your concern. As per the history provided, they may be Tinea corporis. Tinea is a fungal infection affecting various areas of the body and spreads fast, and is contagious. Although it is not a life-threatening problem, it is a skin infection that completely goes away, therefore, do not worry. Tinea appears due to multiple reasons, including sweating, decreased immunity, contact with an infected individual or sharing of belongings, and stagnation of moisture, especially after a bath when complete towel drying and airing is not ensured. I suggest the following. Use Ketoconazole soap twice daily. Apply it on the affected parts and not on normal skin. Keep the lather on the affected area for five minutes and wash it off. In the rest of the areas, a normal soap can be used. Apply Terbinafine (Terbinafine Hydrochloride) cream twice daily on the affected areas. After taking a bath with soap, dry the areas well; there should not be any moisture and apply the cream. Make sure to wash your fingers well with soap after applying the medication on the affected area, or you may also use gloves to apply and make sure the cream is well absorbed. Use Terbinafine dusting powder in the afternoon and evening. Dust the powder on the affected area. Moisture should not be kept stagnant. Take Itraconazole capsule 200 mg once daily is to be taken after food for four weeks, preferably at night. Take Vitamin B complex tablet once daily after food in the morning for two months. Take the Cetirizine (Cetirizine Hydrochloride) tablet 10 mg one hour before going to sleep for three weeks to reduce the itching. Do not worry; it will heal slowly with proper treatment. However, follow up after four weeks to update me on your progress. I hope I was helpful to you. Thank you.