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A Clinical Atlas of 101 Common Skin Diseases

Cysts and Cystic Hamartomas

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Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated with other epithelial elements of adnexa in the case of cystic hamartomas.

A Clinical Atlas of 101 Common Skin Diseases

Sebaceous Gland Hyperplasia

An enlargement of normal pre-existing sebaceous lobules on the face, the forehead, cheeks, and nose in particular, that results in lesions seen clinically to consist of a rim of yellow papules around a central dell that represents a dilated ostium o…

A Clinical Atlas of 101 Common Skin Diseases

Cysts and Cystic Hamartomas

Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Epidermal Cyst and Epidermoid Cyst?

“Epidermoid cyst. Synonym: Sebaceous cyst, steatoma, epithelial cyst. Definition: A cyst containing keratin and its breakdown products, surrounded by an epidermoid wall.” Mackie RM. Epidermal skin tumors. In: Champion RH, Burton JL, Eb…

Differential Diagnosis in Dermatopathology

Infundibular cyst vs. Isthmus-catagen cyst

Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated…

Differential Diagnosis in Dermatopathology

Infundibulo-folliculo-sebaceous cystic hamartoma vs. Steatocystoma

Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated…

Therapeutic Strategies in Dermatology

Hidradenitis Suppurativa: Key Points

Hidradenitis suppurativa (HS) is a chronic inflammatory process affecting skin bearing apocrine glands; the groin, axillae, and inframammary areas are typically involved. The classic lesions of HS include cysts, nodules, sinus tracts, and inflamed…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eruptive Vellus Hair Cyst?

…lso corneocytes and abundant lipid. Last, eruptive vellus hair cyst is a variant of steatocystoma. Steatocystoma is a hamartoma, the most striking aspect of which is a cyst lined by epithelium just like that of a sebaceous duct, i.e., having a thin e…

Differential Diagnosis in Dermatopathology

Sebaceous hyperplasia vs. Nevus sebaceus of Jadassohn

Papules, nodules, and tumors that, on gross examination, are usually skin colored and, on histopathologic examination, consist of an epithelium-lined sac that contains fluid, cells, or both in the case of true cysts and of cysts that are associated…

Therapeutic Strategies in Dermatology

Seborrheic Dermatitis: Initial Evaluation

Initial Evaluation Erythematous, scaly, oily-looking patches on the face (nasolabial folds, medial cheeks, chin, glabella, forehead) and thick crust on the scalp are typical affected areas. Seborrheic dermatitis can also present…

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