Blasto is a protozoa parasite so it cannot be seen with the naked eye, must be viewed under the microscope.
Based on the image, it does look like mucoid plaque. Nematodes (worms) are not related to blasto. Nematodes can be seen with the naked eye and have distinct shapes (tapered head or tail, they are consistent in their shape meaning they are cylindrical.
Did you talk to your doctor about treatment for blasto?