Τι είναι το σημείο Gottron;

Gottron’s papules (Figure 5) are pink-red to violaceous, flat-topped papules and plaques that are located most commonly over the extensor surfaces of the proximal interphalangeal joints of the hands and less so over the metacarpophalangeal and distal interphalangeal joints. The skin over the thumbs is rarely, if ever, affected. The extensor surfaces of the elbows and knees and, less frequently, the malleoli and the vertebral apophyses may be involved as well. These papules may evolve over time to develop depressed atrophic, porcelain-white centers with prominent teleangectasias. Occasionally, the lesions appear to be thickened and pale early in the disease course (hence the name “collodion patches”). Gottron’s sign refers to the macular erythematous patches in a distribution similar to that seen for Gottron’s papules. A photosensitive macular erythematous or violaceous eruption may involve discrete areas of the body, producing specific signs: the “V-sign” for the V of the neck and upper chest; the “shawl-sign” for the nape of the neck, upper back, and posterior aspect of the shoulders. In the most active and severe forms of JDM, the cutaneous rash may extend considerably and eventuate in total body erythema (erythrodermia). Pruritus is a common but underrecognized complaint of JDM patients, and is often associated with secondary skin findings of excoriations and erosions.