ARM, LOWER (FOREARM)

By Gary M. White, MD

Annular

Granuloma Annulare
Granuloma Annulare

Hyperkeratotic Growths

Actinic Keratoses

Cutaneous Horn
Cutaneous Horn

Keratoacanthoma/Squamous Cell Carcinoma
Keratoacanthoma

Itch/Pruritus

Brachioradial Pruritus. Intense itching along the sun-exposed area of the arm during the summer. A variant caused by nerve impingement occurs all year round.
Brachioradial Pruritus

Linear

Allergic Contact Dermatitis. Any time linear lesions don't fit any physiologic lines (e.g., Blaschko's), think of an external cause.

Lymphangitic Spread

Sporotrichoid Spread

Papulonodule

Basal Cell Carcinoma

Squamous Cell Carcinoma
Squamous Cell Carcinoma

Pigmented

Nevi

Melanoma
Melanoma

Photodamage

Solar Lentigines

Acquired Brachioradial Cutaneous Dyschromatosis (melasma of the arms).
Acquired Brachioradial Cutaneous Dyschromatosis

Purpura

Age-Related/Solar Purpura
Age-Related/Solar Purpura

Red, Scaly

Nummular Eczema

Tinea Corporis, shown here with a bit of Majocchi (fungal folliculitis).
Tinea Corporis

Allergic Contact Dermatitis. The forearms may rest on objects with surface allergens, e.g. cleaning products, polishes etc. Irritant contact dermatitis may occur as well.
Allergic contact dermatitis of the arms

Ridge

Disseminated Superficial Actinic Porokeratosis

Verrucous

Squamous Cell Carcinoma
Squamous Cell Carcinoma

Hypertrophic Lupus Erythematosus
Hypertrophic Lupus Erythematosus

White

Idiopathic Guttate Hypomelanosis
Idiopathic Guttate Hypomelanosis

Stellate Pseudoscars, shown here with solar purpura as well.
Stellate Pseudoscars

White Avascular Spots
White Avascular Spots

Rare

Ulceration

Volkmann Syndrome. Asymmetric, well-demarcated stellate ulceration of the forearm associated with neuromuscular defects [JAMA Derm 2014;150;978].

RegionalDerm

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