Skin Disorders Guide

Diagnostic Hallmarks

Distribution: random but some predilection for the back
History of a preceding noninflammatory cyst or nodule
Solid fragments of white keratin on incision and drainage

Clinical Presentation
Asymptomatic, skin-colored epidermoid cysts occasionally become red and tender. When this occurs, differentiation from a furuncle may become difficult. The history of a preceding noninflammatory nodule, the absence [...]

Diagnostic Hallmarks

Distribution: axillae and groin
Nonresponsiveness to antibiotic therapy
Chronic course with recurrence in the same sites

Clinical Presentation
The individual lesions of hidradenitis suppurativa arise as firm, lender, dome-shaped papules and nodules 1 to 3 cm in size. The larger lesions often become fluctuant and drain spontaneously. Pustule formation at the summit of the inflamed nodule is sometimes [...]

Diagnostic Hallmarks

Distribution: no characteristic pattern
Sudden onset
Pain and tenderness
Response to therapy

Clinical Presentation
Furuncles are painful, dome-shaped or slope-shouldered, bright red nodules 1.5 to 3 cm in diameter. Usually, only a single furuncle is present; multiple lesions, if closely grouped, may coalesce to form a carbuncle. The classic signs of inflammation (rubor, dolor, color, and tumor) are all [...]

Diagnostic Hallmarks

Distribution- sun-exposed surfaces of the face, hands, and
shoulders
No seasonal venation in pigment density
Size: 5 to 20 mm
Occurrence in adults

Clinical Presentation
Lentigines (singular- lentigo) are brown macules 5 to 20 mm in diameter. The brown hues vary in intensity from tan to brown-black. They occur singularly or as multiple, closely set (but not cont1uent) lesions [...]

A lesion is a general term for a single, small area of skin disease. Lesions may be solitary or multiple. Terms used to describe these lesions include macules, patches, papules, plaques, nodules, vesicles, pustules, bullae, erosions, and ulcers. Some authorities divide these lesions into primary and secondary types.
Rash
The term rash is collectively used to [...]

Diagnostic Hallmarks

Distribution: sun-exposed surfaces
Fade in winter, darken in summer
Size: smaller than 4 mm
Occurrence primarily in children

Clinical Presentation
Freckles are light-brown macules 1 to 3 mm in diameter. They occur as closely set, but not confluent, lesions on the lace, arms, and other sun-exposed skin. They occur primarily in fair-skinned people and are particularly [...]