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The evaluation of a skin nodule includes a description of its appearance, its location, how it feels to touch and any associated symptoms which may give clues to an underlying medical condition. [4] Often discovered unintentionally on a chest x-ray, a single nodule in the lung requires assessment to exclude cancer. [9]
Nodules are discrete, generally symmetric, hyperpigmented and firm. They are greater than 0.5 cm in both width and depth (as opposed to papules which are less than 0.5 cm). The nodules of PN can appear on any part of the body, but generally are found in areas where patients are able to reach to scratch.
Rheumatoid nodules can also appear in areas of the body other than the skin. Less commonly they occur in the lining of the lungs or other internal organs. The occurrence of nodules in the lungs of miners exposed to silica dust was known as Caplan’s syndrome. [2]
About 20% of people with rheumatoid arthritis develop rheumatoid nodules, which are linked to more severe erosive disease in those patients. [2] The nodules are more common in men, typically manifest in the fifth decade of life, and are primarily found on extensor surfaces like the backs of the fingers and elbows, though they can occur anywhere.
In medical practice, doctors occasionally use the term granuloma in its more literal meaning: "a small nodule". Since a small nodule can represent any tissue from a harmless nevus to a malignant tumor, this use of the term is not very specific.
Erythema nodosum is a form of panniculitis characterised by tender red nodules, 1–10 cm, associated with systemic symptoms including fever, malaise, and joint pain. Nodules may become bluish-purple, yellowing, and green, and subside over a period of 2–6 weeks without ulcerating or scarring.
Pilar sheath acanthoma manifests as a single, skin-colored papule or nodule that is 5–10 mm in diameter and has a keratin-filled pore in the center.These lesions can occur anywhere on the head and neck, however they are typically nearly exclusively located on the upper lip.
Erythema nodosum is characterised by 1–2-inch (25–51 mm) nodules (rounded lumps) below the skin surface, usually on the shins. These subcutaneous nodules can appear anywhere on the body, but the most common sites are the shins, arms, thighs, and torso.