Rashes and their strong marks. Marks?

I am suffering from red coloured rashes on my upper arm and butt from last 3-4 months. They have pus in it. They are itchy and also burning sometimes. From the last 2-3 years I always get such rashes specially in summers. I take bath twice a day daily and use good quality herbal soap containing neem and tulsi and a soft towel. Also I wear very lose clothes at home. I maintain proper hygiene. But still suffering from these rashes. I tried home remedies to get rid of these but nothing worked. Their marks are also very displeasing to see. I really need to get rid of these rashes and their marks also. Please help me through this. What should I do what should I use to get rid of these rashes and marks ? Please tell me.