stretch marks all over my arm now

I have stretch marks everywhere. They don't bother me. What bothers me is these damn new ones that have appeared seemingly over night and it's making me extremely self conscious. 
The only thing I can think of, I've been working out and I just lost 5 pounds. It's really getting me down, especially since summer is coming up. I'm just marked up everywhere :( 
What are the best remedies for stretch marks? I've been applying cocobutter and it's not working. They are darker and bigger than they look in this picture. I have bad lighting. It's just on one freaking arm too. I swear I have the worst skin, I have these on my butt, hips, behind my knees, between my legs, upper thighs, boobs, and now on one of my arms:( and it's not like it's from weight gain. I have been 140 lbs for 5 years. Well now 135