Are there effective natural treatments for puncture wound of the ear?

Evaluate cartilage. Minor injuries effecting the soft tissues only are likely to heal uneventfully but injuries involving the cartilage should be evaluated and may require approximation or disrupted cartilage and/or antibiotics.
That depends. If you are talking about ear piercing then cleansing with an antibacterial or just soap and water is imperative. Silver ion compounds also sulfur, zinc, and copper solutions are very effective.