Table 2.

Sebaceous adnexal tumours. 69 cases in 34 articles. ^a

Benign	Cases/Articles (50/29)	M/F (18/14)	Age range (1/93)	Max diameter range (2–80)	Clinical morphology aspect	Dermoscopy
Folliculosebaceous cystic hamartoma	2/22,192	1/1	29–44	5–15	Pink‐white HN nodules in 1 Asian and 1 Indian patient	• 1: crown vessels + multiple oval‐round yellow‐white structureless areas rimmed by normal pseudo‐reticular pigment network + smaller yellow‐orange dots • 1: pinkish background, central brownish pigmentation, brown dots, yellow globules and white scales, with no visible vessels
Reticulated acanthoma with sebaceous differentiation	4/481,125,134,156	3/1	58–93	11–45	3 plaques, 1 macule. 3 pigmented (2 lower limbs, 1 trunk): brown‐red or ‐orange; 1 nonpigmented (red‐yellow)	• 2: yellow reticular structure over a pinkish background + multiple erosions and peripheral brownish pigmentation (1), dotted, glomerular vessels and white scale (1) • 1: irregular pigmentation with yellow dots with linear or reticular arrangement + dotted and comma‐like vessels • 1: central inverse network (white lines) and peripheral brown pigmentation
Sebaceoma	7/622,42,119,133,151,202	2/5	40–81	4–25	Solitary pink‐red nodules (4), papules (2), plaque (1), mainly on HN. 1 pigmented (dark brown‐blue). 1 on sebaceous nevus 1 patient with Muir‐Torre syndrome	• All: yellow structures (homogenous structureless areas and/or yellowish roundish) and whitish areas + central ulceration (3) • 2: pigmented structures: brown‐grey structureless area (1), asymmetric follicular openings (1) • Vessels: peripheral and thin arborizing (4), linear crown (1) or polymorphic (2)
Sebaceous adenoma	6 (3 patients)/392,109,119	0/1	79	10	Solitary pink‐yellow truncal nodule (Afro‐American woman)	• 1: pinkish background, yellow‐white globules, ulceration and atypical vessels (linear irregular and hairpin)
		1/0	64	7	5 in 2 patients with Muir‐Torre syndrome with multiple pink‐yellow HN and truncal nodules	• 2: yellow structureless and ovoid areas + pinkish background and crown or unfocused arborizing vessels • 3: crateriform appearance with a central ulcerate or keratotic areas + pinkish‐whitish background and peripheral linear crown vessels.
Sebaceous hyperplasia	11/721,59,64,92,137,163,199	5/3	29–70	2–6	10 nonpigmented yellow‐orange papules and 1 bluish papule, mainly on HN. 3 patients had multiple lesions	• All: whitish‐pinkish background with whitish and yellowish globules and clods + central depression (4) (umbilicated center), bonbon toffee sign (2), cumulus sign (2) b • Vessels: mostly linear and crown
Sebaceous nevus	19/6 6,53,90,92,129,186 (+20/11 associated with another AT)	5/3	1–25	7–80	All HN solitary pink‐yellow plaques; 3 pigmented with brown colour	• Global pattern: cobblestone (2), cerebriform (2), papillomatous (3), lobular (1) • All: yellow‐white to brown background, with yellow‐white‐red to brown dots/globules in 14 cases. • 1: Milia‐like cyst and comedo‐like openings • Vessels: no visible (9), linear irregular (4), arborizing (3) glomerular surrounded by white halo (1)
Steatocystoma multiplex	1/1 174	1/0	28	n.r.	Yellowish HN nodule (Indian)	• Yellowish structureless pattern composed by roundish yellowish structures, no visible vessels

Malignant	Cases/Articles (19/8)	M/F (11/8)	Age range (40/102)	Max diameter range (3–40)	Clinical morphology aspect	Dermoscopy
Sebaceous carcinoma	19/8 31,37,79,97,118,124,152,165	11/8	40/102	3–40	All solitary nodules, mostly ulcerated (13) and located on HN (14). 16 pink‐red or yellow; 2 pigmented. 9 in Asian patients, 1 with Muir‐Torre syndrome. 1 on sebaceous nevus	• Mostly pink‐whitish and yellowish background, yellow clods and globules and ulceration • 2: blue ovoid nests and bluish structureless areas • Vessels: polymorphous (9), linear irregular and crown (9)

HN = head and neck; n.r. = not reported.

^a See eReferences.

^b well‐defined milky‐white cloud‐like structures.