Crust (medicine)

Pustule

Other names: Scab[1]
Crust
Specialty| Dermatology
Symptoms| Dry fluid on skin[1]
Causes| Pemphigus vulgaris,[2] impetigo,[3] scabies[4]
Diagnostic method| Visualisation[1]

Crust, also known as a scab, is dry fluid on skin.[1] The fluid generally comprises of dried serum, blood or pus, and is mixed with skin cells and sometimes bacterial debris.[1] Bloody crust may appear red, purple or black.[5] Moist red skin is typically revealed when the crust falls off.[1]

Conditions that produce crust include and pemphigus vulgaris,[2] impetigo,[3] and scabies.[4]

## Gallery[edit | edit source]

* Impetigo with crusts

* Crusted scabies

* Crusted facial acne

* Crusted eczema

* Crusted squamous cell carcinoma

* Pemphigus with crusts

* Botryomycosis

## References[edit | edit source]

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 James, William D.; Elston, Dirk; Treat, James R.; Rosenbach, Misha A.; Neuhaus, Isaac (2020). "2. Cutaneous signs and diagnosis". Andrews' Diseases of the Skin: Clinical Dermatology (13th ed.). Edinburgh: Elsevier. p. 13\. ISBN 978-0-323-54753-6. Archived from the original on 2023-02-09. Retrieved 2023-02-09.
2. ↑ 2.0 2.1 Morris-Jones, Rachael (2019). "1. Introduction". In Morris-Jones, Rachael (ed.). ABC of Dermatology (7th ed.). Hoboken: Wiley Blackwell. pp. 4–6. ISBN 978-1-119-48899-6. Archived from the original on 2023-02-09. Retrieved 2023-02-09.
3. ↑ 3.0 3.1 Benedetti, Julia (December 2021). "Description of Skin Lesions - Dermatologic Disorders". MSD Manual Professional Edition. Archived from the original on 15 April 2022. Retrieved 15 May 2022.
4. ↑ 4.0 4.1 Morris-Jones, Rachael (2019). "15. HIV and skin". In Morris-Jones, Rachael (ed.). ABC of Dermatology (7th ed.). Hoboken: Wiley Blackwell. pp. 128–129. ISBN 978-1-119-48899-6. Archived from the original on 2023-02-09. Retrieved 2023-02-09.
5. ↑ Oakley, Amanda. "Terminology in dermatology | DermNet NZ". dermnetnz.org. Archived from the original on 9 March 2022. Retrieved 15 May 2022.