Progressive pigmentary dermatoses | Nonpalpable cayenne pepper–like purpura on an orange-brown macular base | Biopsy only if clinical diagnosis is in question |
Stasis dermatitis | Hyperpigmentation, varicose veins, dependent edema; scaling, crusting, and ulcerations might be present | Underlying venous insufficiency |
Leukocytoclastic vasculitis | Painful palpable purpura on lower extremities, which might ulcerate | Skin biopsy |
Purpuric contact dermatitis | Purpuric macules, papules, patches, and nodules following textile distribution | Avoidance of suspected contactant |
Early mycosis fungoides | Initial erythematous patches affecting lower trunk and buttocks, progressing to infiltrated plaques and tumours | Skin biopsy |