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Differential diagnosis

Hyperpigmented patches

Fixed drug eruption

Macular lichen planus

Post inflammatory hyperpigmentation

Hypopigmented patches/guttate lesions

Vitiligo

Lichen sclerosus

Erythematous patches

Acquired port wine stain

Linear lesions

Linear atrophoderma of Moulin

Acrodermatitis chronica atrophicans (Lyme disease)

Linear melorheostosis

Plaque morphea

Chronic graft versus host disease

Hypertrophic scar/keloid

Connective tissue nevi

Post radiation

Deep morphea

Lipodystrophy

Other forms of panniculitis

Pansclerotic morphea

Systemic sclerosis