- Indurated erythematous or violaceous nodules of unknown etiology appearing in the first few weeks of life
- Affects full-term or post-term infants.
- Usually spontaneously resolve within a few months
- Occasionally complicated by hypercalcemia that can cause extensive calcification
- Characteristic radial arrays of needle-shaped clefts (dissolved triglyceride crystals) within macrophages and adipocytes
- Patchy fat necrosis
- Mixed inflammatory infiltrate, both septal and lobular