A macule is a flat, discolored spot on the skin that is neither raised nor depressed, such as a freckle or flat mole. It measures less than 1 cm in diameter.

What is the difference between a vesicle and a bulla?

Both are fluid-filled, raised lesions, but a vesicle is smaller than 0.5 cm while a bulla is larger than 0.5 cm. An example of a vesicle is a blister from poison ivy; a bulla is a large blister from a burn.

A pustule is a small, raised lesion filled with pus. It is commonly associated with acne and infected hair follicles.

A wheal is a raised, itchy lesion with an irregular shape caused by a localized allergic reaction or insect sting. Hives (urticaria) are a common example.

What distinguishes a papule from a nodule?

A papule is a small, solid, raised lesion less than 1 cm in diameter, while a nodule is a larger, deeper solid lesion greater than 1 cm that extends into the dermis or subcutaneous tissue.

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Skin Disorders – California Esthetician State Board Exam

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