Steatocystoma multiplexhttps://en.wikipedia.org/wiki/Steatocystoma_multiplex
Steatocystoma multiplex est benigna, autosomal dominans, congenita, quae consequitur plures cystas in corpore hominis. Cystae plerumque parvae sunt (2‑20 mm), sed in diametro plures centimetra esse possunt. Apparunt papulae mollis ad firmam, semi‑translucidas, et continet liquorem oleosum, luteum.

Initium plerumque fit in pubertate, probabiliter ob hormonalem stimulationem unitatis pilosebaceae. Plerumque in thorace oriuntur et possunt etiam inveniri in abdomine, brachiis superioribus, axillis, et facie. In quibusdam individuis, cystae possunt evolvi per totum corpus.

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  • Cum in brachio vel collo observatur, apparet cysta parva, dura, subcutanea, quae asymptomatica esse solet.
    References Steatocystoma Multiplex 38283021 
    NIH
    Steatocystoma multiplex (SM) , quae steatocystomatosis vel epidermalis polycystica morbus notus est, rara et benigna conditio cutis est, quae multiplicibus cystis intradermalibus sebaceis variae magnitudinis. SM asymptomatica, numerosa, rotunda, levia, firma, mobiles papulae cysticae et noduli, saepe sine ulla symptomatis apparet. Hae laesiones plerumque sunt rotundae et magnitudine aequales, a paucis millimetris usque ad centimetra longitudinis. Superficiales laesiones flavescunt, dum laesiones profundae colorem cutis habere solent. Fluidus in his cystis plerumque inodoratus et pinguis est, varius claritatis et coloris gradus. Epidermis superne saepe normalis est, nullo puncto centrali. SM corpus totum involvere potest, sed in regionibus copiosis glandulis pilosebaceis, ut truncus (praesertim regio praesternalis), collum, capillus, axilla, extremitates proximales, et regio inguinalis invenitur.
    Steatocystoma multiplex (SM, also known as steatocystomatosis, sebocystomatosis, or epidermal polycystic disease) is a rare benign intradermal true sebaceous cyst of various sizes. Clinically, SM presents as asymptomatic, numerous, round, smooth, firm, mobile, cystic papules, and nodules. The lesions are uniform, with a size of a few millimeters to centimeters along the long axis. The superficial lesions are yellowish, and deeper lesions tend to be skin-colored. The fluid in SM is odorless, oily, clear or opaque, milky or yellow. The overlying epidermal skin is often normal, with no central punctum. SM can occur anywhere in the body but is more frequently seen in areas rich in pilosebaceous units such as the trunk (especially the presternal region), neck, scalp, axilla, proximal extremities, and inguinal region.
     Steatocystoma multiplex - Case reports 14594591
    Vir XXV annorum venit cum pelle in armis, pectore, et abdomine. Fuerat sine dolore massas per XX annos, incipiens a pectore et dilatans ad bracchia per annos VII.
    A 25-year-old man came in with a skin condition on his arms, chest, and abdomen. He had been with painless lumps for 20 years, starting on his chest and spreading to his arms over the past 7 years.