Steatocystoma multiplex https://en.wikipedia.org/wiki/Steatocystoma_multiplex
Steatocystoma multiplex est morbus benignus, autosomalem dominans, congenitus, qui plures annos in corpore hominis persiste​t. Cystae plerumque parvae sunt (2–20 mm), sed in diametro plures centimetra esse possunt. Cystae molles, semi‑perlucentes, firmae, oleosum, luteumque liquorem continent.

Impetus in adolescibus praefertur ob hormonalem stimulum pilosebaceum. Plerumque in thorace oriuntur, sed possunt etiam apparere in abdomine, brachiis, alis et facie. In quibusdam casibus totum corpus afficere possunt.

Informationes plurimae ― Latine
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 variis magnitudinibus afficit. Nam SM se praebet ut numerosae, leves, firmae, mobiles cystae et massae, saepe sine ulla symptomate apparent. Hae laesiones plerumque sunt rotundae et magnitudine aequae, a paucis millimetris usque ad centimetra. Habent superficiem flavescentem, quae colore cutis superiori aequiparatur. Fluens in his cystis plerumque inodoratus et pinguis est, variis claritatis et colorum gradibus. Dissimilis cystis typicae, fere nulla foramen in centro cutis super cystam visibile est. Aliquando SM in corpus evolvi potest, sed plerumque in regionibus ubi sunt glandulae sebaceae et folliculi pilosi invenitur, ut truncus, collum, caput, alas, brachia, crura, et inguina.
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 adfert cutaneas maculas in brachiis, pectore et abdomine. Per XX annos sine dolore maculas habebat; initium cepit a pectore et per VII annos ad brachia se diffudit.
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.