What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Herpes, Cold Sore, Boil, Cyst, Zit and Pimple

We all suffer from different diseases, at different stages of our lives. Some problems are really common among the people, while others are rare. Pimple, Boil and cold sore are few common skin related issues, which almost everyone faces once in his life time.