A melanoma that lacks pigment, presenting as a pink or red, often ulcerated and bleeding nodule that can be mistaken for other lesions.
Presents as pink-to-red papules or nodules, often on or around the ear, and is characterized by a proliferation of blood vessels and lymphocytes.
An aggressive vascular malignancy, often on the scalp of the elderly, that presents as an ill-defined, expanding, bruise-like patch or purpuric nodule.
A low-grade sarcoma on sun-damaged skin of the elderly, typically presenting as a rapidly growing, solitary, reddish, ulcerated nodule.
Nodular BCC presents as a pearly, pink or red, translucent papule or nodule with surface telangiectasias.
A benign tumor, typically on the lower legs, appearing as a solitary, well-demarcated, moist, reddish-brown plaque or nodule.
Can present as solitary or grouped, violaceous or reddish-brown nodules and tumors, typically on the head, neck, or trunk.
Cancer that has spread to the skin, often appearing as a firm, non-tender, rapidly appearing, reddish or skin-colored nodule.
A low-grade sarcoma that begins as a firm, plaque-like lesion and slowly grows into a large, protuberant, reddish-blue multinodular mass.
Crops of small, reddish-yellow papules with an erythematous halo that appear suddenly, often on extensor surfaces and buttocks, in patients with very high triglycerides.
A deep, tender, red, inflammatory nodule (abscess) evolving from a single hair follicle, which becomes fluctuant and points.
A benign tumor of blood vessels, such as an infantile hemangioma, which appears as a bright red, raised nodule in infants.
A chronic inflammatory condition presenting as recurrent, painful, deep-seated erythematous nodules and abscesses in intertriginous areas.
A previously stable cyst that becomes acutely inflamed, presenting as a tender, red, swollen, and fluctuant nodule.
An inflammatory response to an insect bite that can form a persistent, firm, erythematous, and intensely itchy nodule.
Skin involvement by lymphoma can present as infiltrated, violaceous or erythematous nodules and tumors.
A chronic condition with recurrent crops of reddish-brown papules and nodules that spontaneously regress, often leaving scars.
A rare, aggressive neuroendocrine skin cancer, appearing as a rapidly growing, painless, firm, shiny, pink-red or violaceous nodule on sun-exposed skin.
A viral infection from cattle, causing one or more firm, reddish-blue, painless nodules on the hands, often with a central depression or crust.
A severe form of acne vulgaris with large, hard, painful, deep-seated inflammatory nodules.
A viral infection from sheep or goats, presenting as a solitary, firm, reddish papule on the hand that evolves into a large, weeping nodule with a violaceous rim and central umbilication.
A medium-vessel vasculitis that can cause tender, subcutaneous erythematous nodules, often in a linear or starburst pattern along the course of an artery.
A benign sweat gland tumor, usually on the soles or palms, presenting as a solitary, moist, red, often pedunculated or sessile nodule.
A benign, rapidly growing vascular proliferation that presents as a bright red, friable, raspberry-like nodule that bleeds very easily.
In addition to burrows and papules, scabies can cause persistent, reddish-brown, intensely pruritic nodules, especially on the genitalia and axillae.
A vascular neoplasm presenting as multiple, firm, bluish-red nodules, typically on the distal extremities.
A benign melanocytic nevus, common in children, that often appears as a rapidly growing, symmetric, pink or red, dome-shaped papule or nodule.
Can present as a firm, indurated, hyperkeratotic, or ulcerated erythematous nodule on sun-exposed skin.
A benign adnexal tumor, often arising within a nevus sebaceus on the scalp, that develops into a verrucous or papillomatous reddish nodule.
