Issue with pock marks appearing in sculpted mesh

Hey, I am brand new to Blender and 3D modeling; and I am going along with the Blender Tutorial from Blender Guru on YouTube that makes the donut on the plate with the mug of coffee. I am stuck on the first part while sculpting the icing. For reasons I don’t know, small holes appear all over the mesh of the icing despite following him precisely in the video. I don’t know why they appeared, or how to get rid of them. Any suggestions?

This is what I am referring to