List of cutaneous conditions associated with internal malignancy

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{{see also|List of cutaneous conditions}}

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This is a list of cutaneous conditions associated with internal malignancy; skin markers of internal cancer.{{cite journal |last1=Wick |first1=Mark R. |last2=Patterson |first2=James W. |title=Cutaneous paraneoplastic syndromes |journal=Seminars in Diagnostic Pathology |date=July 2019 |volume=36 |issue=4 |pages=211–228 |doi=10.1053/j.semdp.2019.01.001 |pmid=30736994 |url=https://pubmed.ncbi.nlm.nih.gov/30736994/ |issn=0740-2570}} It does not include skin infections associated with cancer or cancers that spread to skin. Some have stronger associations with cancers than others.{{cite book |last1=Fonia |first1=Athina |last2=Baran |first2=Robert |editor1-last=Lipner |editor1-first=Shari |title=Nail Disorders: Diagnosis and Management, An Issue of Dermatologic Clinics |date=2021 |publisher=Elsevier |isbn=978-0-323-70924-8 |pages=175-182 |chapter-url=https://books.google.com/books?id=0B0mEAAAQBAJ&pg=PA175 |language=en |chapter=Cutaneous paraneoplastic syndromes with nail involvement }}

class="wikitable" |+ Cutaneous conditions associated with internal benign tumors and/or malignancies
Cutaneous condition	Internal malignancy
Erythema gyratum repens	Lung cancer
Hypertrichosis lanuginosa acquisita	Lung cancer
Paraneoplastic pemphigus	Non-Hodgkin lymphomaNon-Hodgkin lymphoma is the most common cause of paraneoplastic pemphigus in adults. Castleman's disease is the most common cause of paraneoplastic pemphigus in children. Chronic lymphocytic leukemia Castleman's disease Sarcoma Thymoma
Tripe palms	Lung cancer
| Tripe palms with acanthosis nigricans	Stomach cancer
Pityriasis rotunda |Hepatocellular carcinoma
Migratory thrombophlebitis |Pancreatic adenocarcinoma
Leser–Trélat sign |Gastrointestinal adenocarcinoma
Acquired ichthyosis |Hodgkin disease
Pityriasis rotunda |Hepatocellular carcinoma
Paraneoplastic pigmentation |Small cell bronchial carcinoma
Acrokeratosis paraneoplastica |Squamous cell carcinoma of the upper respiratory or gastrointestinal tracts
Necrolytic migratory erythema |Glucagon secreting pancreatic islet cell adenoma
Dermatomyositis |Lung cancer in men, breast and gynaecological tumours in women and colorectal cancers in both sexes
Scleroderma‐like skin changes |Carcinoid syndrome
Paraneoplastic pemphigus |B‐cell proliferations and thymoma or thymoma‐like neoplasms; specifically Non Hodgkin's lymphoma (42%)
Dermatitis herpetiformis |Lymphoma
Porphyria cutanea tarda and variegate porphyrias |Hepatocellular Carcinoma
Erythroderma and exfoliative dermatitis |Mycosis fungoides or Sézary syndrome
Pyoderma gangrenosum |Hematological malignancy
Sweet syndrome |Hematological malignancy