Steam is sometimes used in a facial to:

Steam may be used in a facial to help warm and soften the skin, which can make subsequent steps more comfortable and effective. It must be used at a safe distance and temperature and avoided or modified for clients with conditions that contraindicate heat (such as certain sensitive or vascular conditions). Like all facial steps, steaming is applied thoughtfully based on the client's skin and any contraindications. Understanding the purpose and cautious use of steam is part of the facial-services content.