Glomuvenous Malformation (Glomus Tumor) Key Points Glomuvenous malformation is a rare benign hamartoma of the glomus body The pathogenesis and genetics of sporadic GVM are poorly understood but BRAF or…

Fibrous Histiocytoma Key Points Fibrous histiocytoma (FH) is a soft-tissue tumor characterized by a proliferation of spindle-shaped cells, usually admixed with inflammatory cells It is believed to originate from a…

Erythema Multiforme Key Points Erythema multiforme (EM) is an acute, self-limited or recurrent, immune-mediated disorder that affects the skin and mucous membranes Clinically, EM is classified as EM minor and…

Erysipelas Key Points Erysipelas is a nonnecrotizing bacterial infection of the superficial layers of the skin The most common causative organism is Streptococcus pyogenes (group A streptococci) S. pyogenes has…

Distensible Venous Malformations (Varices) Key Points Distensible venous malformations (DVMs) are abnormally enlarged and tortuous veins, or less commonly Periocular DVMs are more commonly seen in the orbit than in…

Dermatofibroma Key Points Dermatofibroma is a benign, cutaneous form of fibrous histiocytoma occurring in the dermis of the skin The etiology remains controversial but theories include a reactive process or…

Dermoid Cyst Key Points Dermoid cysts are a common developmental cystic choristoma Approximately 7% occur in the head and neck most commonly in the periorbital region Ninety percent or more…

Cutaneous Horn Key Points A cutaneous horn is a firm, variably pigmented, conical projection composed of compacted keratin They may arise on top of benign, premalignant, or malignant skin lesions…

Comedones Key Points A comedo is a skin condition that occurs when a dilated pilosebaceous orifice is clogged by a keratotic plug and sebum They may be open (blackheads) or…

Chalazion and Hordeolum Key Points Hordeolum is a common painful infection of the eyelid margin It is usually caused by a staphylococcal infection and presents as a red swollen furuncle…