Pustule

Primary lesions

• Pustule: A pustule is a small elevation of the skin usually consisting of necrotic inflammatory cells. Pustulation is the formation, breaking out of, or state of having pustules and is sometimes synonymous with pustule.
• Cyst: A cyst is an epithelial-lined cavity.
• Wheal: A wheal is a rounded or flat-topped, pale red papule or plaque that is characteristically evanescent, disappearing within 24 to 48 hours. The temporarily raised skin on the site of a properly delivered intradermal (ID) injection is also called a wheal, with the ID injection process itself frequently referred to as simply "raising a wheal" in medical texts.
• Welts: Welts occur as a result of blunt force being applied to the body with elongated objects without sharp edges.
• Telangiectasia: A telangiectasia represents an enlargement of superficial blood vessels to the point of being visible.
• Burrow: A burrow appears as a slightly elevated, grayish, tortuous line in the skin, and is caused by burrowing organisms.