Skin: Primary Lesions

Question 1

Macule

Answer 1

Colour change only, flat, < 1cm diameter.

Question 2

Patch

Answer 2

Macule > 1cm diameter

Question 3

Papule

Answer 3

Solid, elevated, < 1cm, superficial thickening of dermis. Ex. Nevus/mole

Question 4

Plaque

Answer 4

Surface elevation > 1cm, plateau like (psoriasis)

Question 5

Nodule

Answer 5

Solid, elevated, >1cm, differs from plaque because goes deeper into dermis, more rigid.

Question 6

Wheal

Answer 6

Superficial, raised, transient and reddish, slightly irregular shape because of edema. Ex. Mosquito bite, allergic reaction.

Question 7

Tumour

Answer 7

Larger than a few cm, deeper into dermis, benign or malignant.

Question 8

Urticaria

Answer 8

Wheals that come together to form an extensive reaction, hives.

Question 9

Vesicle

Answer 9

Aka blister, elevated cavity containing fluid up to 1cm

Question 10

Bulla

Answer 10

Ex. Friction blister, greater than 1cm, superficial, thin walled, ruptures easily.

Question 11

Pustule

Answer 11

Cavity filled with pus, not clear liquid

Question 12

Cyst

Answer 12

Fluid filled, goes deep into skin, tensely elevated skin