Hello, A comedo is a clogged hair follicle (pore) in the skin. A comedo can be open (blackhead) or closed by skin (whitehead), and occur with or without acne. Use non-oily cleansers or mild soap which donot cause irritation to the skin as regular soap. Squeezing blackheads can remove them, but it can also damage the skin (scar formation). Comedo extraction should be done with careful hygiene in beauty salons and by dermatologists, usually after using steam or warm water.Consult dermatologist .