Primary Skin Lesions

Question 1

1. Macule

2. Patch

Answer 1

1. Color change, flat, circumscribed, less than 1 cm; frekcles, measels, moles (nevi)
2. Macules larger than 1 cm; cafe au lait, mongolian spots, measels rash

Question 2

1. Papule

2. Plaque

Answer 2

1. You can feel it, solid, elevated, less than 1 cm; caused by superficial thickening in the epidermis; elevated mole, wart (verruca)
2. Papules coalesce to form surface elevation wider than 1 cm, plateau-like disc shaped lesion; psoriasis

Question 3

1. Nodule

2. Tumor

Answer 3

1. Solid, elevated, hard or soft, larger than 1 cm, may extend deeper into dermis than papule, xanthoma (fat build up under skin), fibroma
2. Larger than a few centimeters in diameter, firm or soft, deeper into dermis, benign or malignant; lipoma (growth of fat cells), hemangioma

Question 4

1. Wheal

2. Urticaria

Answer 4

1. Superficial, raised, transient, and erythematous; slightly irregular in shape due to edema; mosquito bite, allergic reaction
2. Wheals coalesce to form extensive reaction, severe pruritic (itching), Hives

Question 5

1. Vesicle

2. Bulla

Answer 5

1. Elevated cavity containing free fluid, up to 1 cm, a “blister,” clear serum flows if wall is ruptured, herpes simplex, chickenpox, shingles
2. Larger than 1 cm in diameter, usually single chambered (unilocular); superficial, thin walled and ruptures easily, friction blister, burns

Question 6

1. Cyst

Answer 6

1. Encapsulated fluid-filled cavity in dermis or subcutaneous layer, tensely elevating skin; sebaceous cyst, wen.

Question 7

1. Pustule

Answer 7

1. Turbid fluid (pus) in the cavity, circumscribed and elevated; acne