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CommonDiabetes-associatedICD-10 L98.9

Diabetic dermopathy

Shin spots · pigmented pretibial papules · pretibial spots

Diabetic dermopathy is the most common cutaneous manifestation of diabetes mellitus, occurring in up to 50% of patients with long-standing disease. It presents as multiple atrophic hyperpigmented pretibial macules / patches following minor trauma or microvascular insult. It is a common DDx for atypical naevi, scars and chronic atrophy patches; importantly its presence correlates with diabetic micro- and macrovascular complications.

CurrentLast reviewed 16 May 2026

Pathogenesis

  • Microvascular damage in pretibial skin → small infarcts / oedema / fibrosis with haemosiderin deposition.
  • Strong association with retinopathy, nephropathy, peripheral and autonomic neuropathy — a marker of broader microvascular complications.
  • Trauma may precipitate; spontaneous evolution also occurs.

Clinical features

  • Small (5-10 mm) well-demarcated atrophic patches with brown-purple hyperpigmentation.
  • Bilateral asymmetric, pretibial; rarely on forearms, thighs.
  • Single lesions evolve over weeks-months and resolve over 1-2 years; new crops continually appear.
  • Asymptomatic.

Differentials

  • Post-traumatic / venous-stasis pigmentation.
  • Stellate pseudoscars on forearms (photoaging).
  • Schamberg disease / pigmented purpura — cayenne-pepper petechiae.
  • Necrobiosis lipoidica — yellow-brown atrophic plaques; pretibial.
  • Atrophie blanche — stellate white atrophic scars with peripheral telangiectasia (livedoid vasculopathy).
  • Lichen aureus, post-inflammatory hyperpigmentation, fixed drug eruption.

Management

  • No specific cutaneous treatment; lesions self-limit.
  • Optimise glycaemic control; assess and manage broader diabetic complications.
  • Counsel about cosmetic persistence; sun protection to prevent further pigmentation.
  • Refer for diabetic foot screening; ophthalmology / renal / neuropathy review.
  • Biopsy only if atypical features (asymmetry, growth, single lesion progression) to exclude pigmented BCC or atypical melanocytic lesion.

References

  1. Morgan AJ, Schwartz RA. Diabetic dermopathy: a subtle sign with grave implications. J Am Acad Dermatol. 2008;58:447-451.
  2. Romano G et al. Skin lesions in diabetes mellitus: prevalence and clinical correlations. Diabetes Res Clin Pract. 1998;39:101-106.
  3. Shemer A et al. Diabetic dermopathy and internal complications in diabetes mellitus. Int J Dermatol. 1998;37:113-115.

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