You know, that sounds like what I had. However, I have eczema and had scabies. I had these little kind of watery-blister type clusters that slowly turned red like pimples like you described . And they were on my hands, mostly on the sides of my fingers but definately some on my knuckles. I then got little "scabs", they were like lines that looked like scabs, and that was my scabies . But the red clustering blisters is actually eczema, and I use Clobetasol for spot treatments but I'm on Methotrexate which is a pill becuase my eczema got so bad. See a dermatologist, I guarantee you have eczema which is completely controllable and scabies is 100% treatable.