A blackhead is one type of comedo, or acne bump. Comedones can be open or closed, based on whether the skin surface is ...
Some common descriptive terms of primary lesions are macule, papule, nodule, plaque, wheal, vesicle, bulla, pustule, cyst, comedo, and burrow. Secondary lesions are the patient's response to a ...
Comedo (comedones): horny material constituting a plug in the pilosebaceous follicle; sometimes called a zit, it may be open or closed Blackhead: when the material oxidizes, it turns black ...