Step 1: Name the entity. Schamberg's purpura is the leading pigmented purpuric dermatosis, caused by leaky dermal capillaries depositing iron pigment in the skin.
Step 2: Picture the lesions. Tiny pinpoint purpuric spots described as cayenne-pepper specks appear on a brownish background.
Step 3: Pinpoint the location. These lesions cluster on the lower limbs, especially around the ankles and shins, and are usually symptomless, so the feet and lower legs are the classic site.
Step 4: Face, chest and arms are not typical, making feet the right choice.
\[\boxed{\text{Feet (lower legs)}}\]