Looks more like my hull
after I've scraped the barnacles
off it. The little circles are where they had stuck themselves to your hull
. I would sand the area and examine it again. You can test for blisters by jabbing the center of a circle with a sharp awl. It shouldnt be soft.
Be wary of boatyard workers telling you that you have blisters; they need work and see yachties as cash cows. One guy looked me straight in the eyes and told me I needed a gelcoat
peel and epoxy job, which he could do. I popped a barnacle off the hull, pointed to the circle, and asked him if he had ever scraped a bottom before. End of conversation.
I already knew he had a reputation around the yard for selling unneeded work...