This started with itching and I intially felt it's cause of sweat later I tried applying mupivate ointment,but it dint help.. the skin keeps peeling and this is on the lower back.. it become very itchy if sweat and it has spread in the past 6months.. Kindly suggest an external cream to apply

This sounds like a case of fungal infection, specifically tinea corporis. I recommend using an antifungal cream such as Clotrimazole 1% cream. Apply a thin layer to the affected area twice a day for 2-4 weeks. Make sure to keep the area clean and dry to prevent further spread of the infection.