Also known as chilblains.

Clinical Features:

• Caused by exposure to cold
• Red to purple macules, papules or nodules on acral skin or the thighs or buttocks

Histologic Features:

• Superficial and deep perivascular lymphocytic infiltrate
• Marked edema of the papillary dermis
• Edema of blood vessel with transmural lymphocytic infiltrates
• Occasional fibrin thrombi in the capillaries of the dermal papillae
• The epidermis is usually unremarkable, but epidermal necrosis or ulceration may sometimes be seen.

Cases associated with this book:

Perniosis
Author: Stephen Lyle, M.D., Ph.D.

Conference: Dr. Z's Consultations

Perniosis
Author: Artur Zembowicz M.D. Ph.D.

Conference: DermatopathologyConsultations.com Teaching Collection