dnobo

Koebner Phenomenon in Psoriasis

A linear stripe of psoriasis in a patient with a diffuse psoriasis flare after stopping methotrexate. The patient reports that this lesion formed after she was scratched on her leg by her cat.

Brown Recluse Bite (Loxoscelism)

A classic presentation of necrotic arachnidism (Loxoscelism) in a 35 year old male. While a variety of spider bites can cause this reaction, it is most commonly associated with brown recluse bites.

The bites are usually painless, but soon can develop an eschar followed by tissue necrosis and skin sloughing. Necrosis is more common in areas of increased adipose.