Blackhead and Blackheads

Blackhead noun - A black-tipped plug clogging a pore of the skin.

Blackheads and blackhead are semantically related in blemishes topic. In some cases you can use "Blackheads" instead a noun "Blackhead".

Blackhead and blackheads are semantically related in pimple topic. Sometimes you can use "Blackhead" instead a noun "Blackheads", if it concerns topics such as flaw, small swelling on the skin.