Pin Pricks & Summer [I Have Diabetes]

I'm a T1/3c diabetic, and insulin-dependent. I inject up to 7-8 times a day.
My thighs and stomach area can be covered with tiny pin pricks. I wondered if anyone has found a way to reduce these? I moisturise the injection areas daily but the little marks still remain. With the summer coming, I don't really want the marks visible wearing speedos!