Colloids are particles that have a diameter of between approximately 1 and 1,000 nanometres and that are evenly dispersed in fluids. Colloids are also known as colloidal dispersions because the ...

White spots on the face can cover a small or large area of skin. They can be hard bumps or flat patches. Possible causes include milia, pityriasis alba, vitiligo, and more. Many people experience ...