A vesicle, bleb, and pustule are hollow; macule, papule, and tubercle are solid.
Scale. (Squama). This is a dry attached or unattached thin piece from the skin as a result of disease of the skin.
Crust. This is a dried mass as a result of fluid oozing from a diseased skin.
Excoriation. Like a scratch mark.
Fissures. This is a crack, like that found on chapped hands.
Ulcer. (Sore). Eating away of the parts.
Scar. Ulcer healed leaving a mark, like from a healed cut.
Pigmentation. Discoloration.
ACNE. (Simple Acne).—This is an inflammation of the sebaceous (fatty, cheesy) glands. It forms these pimples or pustules and these are intermingled with black-heads (comedones), flesh-worms. They vary from a pin-head to a split-pea in size, and are of a bright or dark red color. They occur for the most part on the face; also on the back, neck and chest.
Condition.—An over secretion, or alteration and retention of the fatty (sebaceous) matter, and this is followed by inflammation involving the glands, ducts of the glands, and hair follicles. Pus often forms and tissue may be destroyed.