Chapter 5: Types of Lesions of the Skin Layers Flashcards
What is a skin lesion?
A pathologic change of the tissue due to disease or injury.
What is a Macule?
A circumscribed area of change in skin color.
What is the elevation and depression of a Macule?
Less than 1 cm in diameter.
What is an example of a Macule?
A freckle.
What is a Papule?
A superficial, elevated solid lesion.
What is the elevation and depression of a Papule?
Generally less than 0.5 cm in diameter.
What is an example of a Papule?
An insect bite.
What is a Palque?
A Plateau-like elevation above the skin surface formed by closely space papules.
What is an example of a Plaque?
Plaques from psoriasis.
What is a Nodule?
A palpable, solid lesion that is larger than a papule.
What does a Nodule may involve?
The epidermis, dermis and subcutaneous tissue.
What differentiates a Nodule from a Papule?
The depth of involvement and the size.
What type of patients develop Nodules under the skin, usually near joints?
Some patients with rheumatoid arthritis.
What is a Wheal?
A rounded pale red papule that itches.
A Wheal is also known as?
Welt.
How long it takes a Wheal to disappear?
Within 24 to 48 hrs.
What is an example of Wheal?
Hives from an allergic reaction.
How does a Crust develops.
When serum, blood or pus dries on the skin’s surface.
What is an example of a crust?
A scab.
What is a scar (cicatrix)?
The fibrous tissue replacement after damage to the skin from a wound or injury.
Since the skin cannot regenerate, what does the collagen in scar tissue does?
Reconnects the broken skin.
What is the difference between the scar tissue and the tissue before the wound?
Scar is less strong and less elastic.
Are sweat glands and hair follicles present in scar tissue?
No.
How does an Ulcer heals?
Always with scar formation.
What is an example of an Ulcer?
A bedsore.
