Merck Manual

Please confirm that you are a health care professional

honeypot link

Skin Manifestations of Internal Disease


Julia Benedetti

, MD, Harvard Medical School

Last full review/revision Feb 2019| Content last modified Feb 2019
Click here for Patient Education
Topic Resources

The skin frequently serves as a marker for underlying internal disease. The type of lesion typically relates to a specific disease or type of disease.

Internal cancer

Patients with dermatomyositis who are over age 40 have an increased risk of breast, lung, ovarian, and gastrointestinal cancers.

Acute onset of multiple seborrheic keratoses (Leser-Trélat sign) may indicate underlying internal cancer, particularly adenocarcinoma. However, because of the high prevalence of seborrheic keratoses in healthy adults, this sign may be overdiagnosed.

Acute febrile neutrophilic dermatosis (Sweet syndrome) is sometimes associated with hematologic cancer.

Acanthosis nigricans that is associated with cancer can be of rapid onset and particularly widespread. Acquired ichthyosis or pruritus without a clearly associated dermatitis may indicate occult cancer, often lymphoma.

Paraneoplastic pemphigus is a relatively rare autoimmune blistering disease that has been associated with various cancers, including leukemias.

Carcinoid syndrome (flushing and erythema of the neck) is associated with carcinoid tumor.

Erythema gyratum repens is a rare eruption consisting of concentric erythematous lesions, resembling wood grain, which has been associated with various cancers.


Many skin findings are associated with endocrinopathies but are not specific.

Patients with diabetes mellitus may have acanthosis nigricans, necrobiosis lipoidica, perforating disorders, and scleredema.

Thyroid disease, both hypothyroidism and hyperthyroidism, can affect hair, nails, and skin.

Cushing syndrome causes striae distensae, moon facies, and skin fragility.

Addison disease is characterized by hyperpigmentation that is accentuated in skin creases and areas of trauma.

Gastrointestinal (GI) disorders

Skin conditions commonly associated with GI disorders include

Click here for Patient Education
NOTE: This is the Professional Version. CONSUMERS: Click here for the Consumer Version
Professionals also read

Also of Interest

Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID