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The incidence of APP is unknown. The condition is rare, but some professionals suggest that it is merely underdiagnosed because it is largely asymptomatic. Diagnosis is based on clinical findings; however, histology can play a role in excluding other diagnoses.
Asymptomatic round or oval depressed lesions develop insidiously over many years. They are most commonly seen on the trunk—primarily the lower back and abdomen—and can spread unilaterally or in a bilaterally symmetric distribution. Zosteriform distribution has also been observed.1 Affected skin is described as having an inverted plaque appearance, which Stoner and Dixon described as resembling “footprints in the snow.”5 The lesions can be bluish-violet, slate-gray, or brown in colour and have irregular, sharply demarcated borders. Initially, single or multiple patches, 2 to 3 cm in diameter, appear on the skin. Although the lesions start out small, they can grow and coalesce to encompass large areas of the trunk and proximal extremities.
Over time, pigmentation of affected areas fades and atrophic characteristics develop; lesions typically sink 1 to 2 mm from adjacent unaffected areas. The resulting sharply demarcated edges, referred to as “cliff drop” borders, tend to be less abrupt on abdominal lesions and more obvious on the back and proximal extremities. Generally, lesions become quiescent upon reaching this atrophic phase, and tend not to progress or enlarge further.
Although debate continues, most of the recent literature indicates that APP and morphea are related. Buechner and Rufli describe APP as an “abortive, primarily atrophic variant of morphea”6 and Amano et al believe that morphea and APP are a “similar nosologic entity.”7 Although similarly atrophic in nature, the conditions can be distinguished by several features. Morphea tends to have a later age of onset, occurring mainly in the third through fifth decades of life. Morphea runs a shorter course than APP, burning out after 3 to 5 years compared with APP’s 10- to 20-year progression. Morphea plaques are ivory with a lilac border and tend to appear more inflamed, exhibiting induration, edema, and erythema.5 The atrophic lesions of APP are violaceous or brown with sharply demarcated borders and no evidence of ongoing inflammation.
Further debate also exists over the relationship of the disease to Borrelia infections. Past studies have found that 28.5% to 53% of patients with APP also have anti–Borrelia burgdorferi antibodies compared with 14% of control subjects.6,8 The role of B burgdorferi in APP is unclear, but some physicians will use positive test results for B burgdorferi as support for treating APP with antibiotics.
Other treatment options include topical steroids and topical retinoids. For those with new-onset APP, oral antibiotics such as doxycycline or amoxicillin in doses appropriate for lyme disease might be attempted. Sun precautions are important, as lesions can darken with sun exposure. Unfortunately, data in the current literature do not enable endorsement of any one particular treatment.
Although cosmetically distressing, APP is a benign condition. The challenge to family physicians lies mostly in the diagnosis. Once this has been established through careful history, physical examination, histologic evidence, or dermatology referral, reassuring patients that the condition is benign and will eventually cease to progress is the family physician’s best tool in the management of APP.

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