[BellaVT]

Since you asked for "any idea", I'll assume you are stumped and offer a very low probability possibility. Fungal nose infections can cause an acidic discharge that discolors the nose in a somewhat similar pattern to that:

Unlikely that this would be the only symptom, and probably wouldn't cause the hair loss out that far, but did look a little reminiscent of the way the light skin extends around the flare of the nose.