do cold sores turn yellow
wikiHow to Treat a Cold Sore or Fever Blisters. Herpes Simplex, also known as cold sores or fever blisters, are painful lesions which usually form on the lips, chin, cheeks, or nostrils. The blisters typically turn into yellow-crusted sores and then disappear within a couple of weeks. Unfortunately, people who get cold sores, which are caused by the herpes simplex virus (usually type 1), generally get outbreaks over and over again, and they are highly contagious.