RT Book, Section A1 Rongioletti, Franco A1 Barnhill, Raymond L. A2 Barnhill, Raymond L. A2 Crowson, A. Neil A2 Magro, Cynthia M. A2 Piepkorn, Michael W. A2 Kutzner, Heinz A2 Desman, Garrett T. SR Print(0) ID 1178392923 T1 Deposition Disorders T2 Barnhill's Dermatopathology, 4e YR 2020 FD 2020 PB McGraw Hill Education PP New York, NY SN 9780071828222 LK dermatology.mhmedical.com/content.aspx?aid=1178392923 RD 2024/04/24 AB Various substances may form deposits in the skin. They may be classified as endogenous and exogenous. Endogenous substances are the principal topic of this chapter. They include substances that are normal constituents of the skin but are abnormally deposited (eg, increased deposition of mucin) and substances that are not normal constituents of the skin (eg, amyloid). Exogenous pigmentary deposits, such as tattoos, drug-related pigmentation and heavy metals, and the special category of endogenous deposition, such as melanin depositions, are discussed in Chap. 15.