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By Gary M. White, MD

Acneiform

Acne Vulgaris
Acne Vulgaris on the Back

Acne Conglobata

Pityrosporum Folliculitis
Pityrosporum Folliculitis

Miliaria

Acne Fulminans
Acne Fulminans

Blue

Acquired Dermal Melanocytosis
Acquired Dermal Melanocytosis

Enlarged

Benign Symmetric Lipomatosis
Madelung's Disease

Hypertrichosis

Congenital Hypertrichosis of the back.
Congenital Hypertrichosis of the back

Indurated

Scleredema Diabeticorum
Scleredema Diabeticorum

Itchy

See Pruritus below.

Linear

Striae Distensae. Transverse, atrophic, red, violaceous or white lines running across the lumbosacral area are common manifestations in men of striae distensae or stretch marks and have an incidence of approximately 5%. When new, they are pink or red. After a time, they turn white.
Striae Distensae

Linear Focal Elastosis
Linear Focal Elastosis

Nodule

Epidermal Inclusion Cyst
Epidermal Inclusion Cyst

Lipoma
Lipoma of the neck

Papules

Keloid
Keloids of the back

Papulosquamous

Subacute Cutaneous Lupus Erythematosus
Subacute Cutaneous Lupus Erythematosus

Pigmented

Seborrheic Keratosis
Seborrheic Keratosis of the back

Tinea Versicolor
Tinea Versicolor

Nevi

Melanoma
Melanoma of the back

Photodamage/Solar Lentigines
Photodamage

Macular Amyloidosis induced by rubbing in notalgia paresthetica. Also called Puzzling Posterior Pigmented Pruritic Patches.
Notalgia Paresthetica

Nevus of Ito

Acquired Dermal Melanocytosis
Acquired Dermal Melanocytosis

Atrophoderma of Pasini and Pierini
Atrophoderma of Pasini and Pierini

Plaques

Sweet's Syndrome
Sweet's Syndrome

Pruritus

An itchy back is very common. Diffuse dry skin and maybe a little eczema is common, especially in the elderly. See xerosis. If there is one fixed spot, usually just to the left or right of the midline, a pinched nerve is usually the cause. See notalgia paresthetica.
Notalgia Paresthetica

Red

Photodistributed eruptions including dermatomyositis.
Dermatomyositis of the shoulder

Reactive Erythema. This red band occurs for 10-30 minutes after a person has been sitting in a chair putting pressure on the skin. When the pressure is relieved, the skin's blood vessels dilate, making the skin red for a time.
Reactive Erythema

Red Plaque

Superficial Basal Cell Carcinoma. Typical red plaques (outlined here for treatment) on a sun-damaged back.
Superficial Basal Cell Carcinoma

Vascular

The two classic lesions in adults--the Cherry Angioma and the Seborrheic Keratosis.
Seborrheic Keratosis, Cherry Angioma

White

Tinea Versicolor
Tinea Versicolor

Progressive Macular Hypomelanosis
Progressive Macular Hypomelanosis

Neurotic Excoriations. Caused by scratching, scratching, and more scratching!
Neurotic Excoriations

Papular Acne Scars

RegionalDerm

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