Is it normal to have random bruising while taking isotretinoin? (photos)

I started isotretinoin 25 days ago. Day 4 I noticed I had 5-6 bruises on my legs. The next night I checked my legs and saw there were now 12 bruises. I called my dermatologist who said to stop the med until we got labs and could discuss the results at my 1 mo. f/up. I met with my derm 2 days ago & labs showed nothing wrong. He told me to start back on the medicine at the same dose. Two days in, I have 3 bruises on my legs again. What can cause this, is this normal, and what should I do?