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Cyst can turn out to be a pustule but a pustule cannot be a cyst.
I had a pustule that was small inflamed swelling of the skin that is filled with pus
A pustule is a small accumulation of pus, either in the epidermis or dermis, or inside a pimple.
A raised lesion filled with pus. A pustule is usually the result of an infection, such as acne, imptigeo, or boils.
A type of small scar or a pustule.