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"Haemosiderin staining" describes orange/red/brown skin hyperpigmentation caused by haemosiderin (an iron-containing pigment found in blood) leaking into the skin.
Causes:
Chronic venous insufficiency (in lower legs)
Skin inflammation
Trauma e.g. wound, fracture, surgery
Pigmented purpuric dermatoses
Haemochromatosis
Haemosiderin staining may be exacerbated by anticoagulant use as this increases extravasation (leakage) of red blood cells into the skin.
See an example here.
In the UK and US, the main causes are gallstones and alcohol.
Use the mnemonic 'I GET SMASHED':
Idiopathic
Gallstones
Ethanol
Trauma
Steroids
Mumps / Malignancy
Autoimmune
Scorpion stings
Hypercalcaemia / Hypertriglyceridaemia / Hypothermia
ERCP
Drugs (including azathioprine, mesalazine, bendroflumethiazide, furosemide, steroids, sodium valproate)