Desonide is a topical (for the skin) steroid. It reduces the actions of chemicals in the body that cause inflammation, redness, and swelling. Desonide topical is used to treat the inflammation and itching caused by a number of skin conditions such as allergic reactions, eczema, and psoriasis. (from RxList.com)
Alternatives: Coconut oil helps skin redness. Cucumber has anti-inflammatory properties when left on the skin for 5-10 minutes. Applying olive oil to the rash, washing the affected area with chamomile tea among other options are listed in a useful article on NaturalNews.com.
Alternative Drugs: Hydrocortisone, fluocinonide, Protopic