Hello, I normally do not have smelly sweat, but these days I feel my sweat smells under one are, and I have red itchy bumps all over, I scratch them and they leave marks all over , do I have allergy ? I have never had any kind of allergy all my life.

Take a shower more often. It's probably from sweating and rubing in that area. Wear a good deoderant antipersperant and shower, shower shower.

Thanks for replying, I take a shower normally twice a day, this smelly sweat under one arm and these itchy red bumps are new and I do not know , I was thinking about a lot of things like I might be diabetic or I have STD. is there STD have these symptoms?

I never heard of this with Diabetes as most of my family are anad an std under the arm. Unless you stuck a penis under there I don't understand how an STD would get there.

There are other reasons for your problem . May I suggest you contact your regular docto and get checked out.