is a blackhead also called a comedo
A comedo is the medical term for a blackhead or whitehead, acne lesions that form when your pores get blocked. When the pore is completely closed, a whitehead or closed comedo forms. When the pore is clogged but remains open at the surface, a blackhead or open comedo forms. Pimples form when the blockage occurs deeper within your skin. The deeper the blockage, the more likely pus will fill the pimple. Painful cysts or nodules, the most severe type of acne lesions, form deep under the skin.