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Use mild soap and lukewarm/cool water.   You can use a cool, damp towel applied to the affected area, but avoid any rubbing that may irritate the skin.  Gently place the towel on the skin.  Be sure that the temperature of the water is not too cold, as this can have negative effects on the skin immediately after a burn (cooling burned skin with excessive cold too rapidly slows down healing and increases the chances of a frostbite injury on top of the burn).  If the burn continues to cause irritation, you can relieve this by taking frequent showers or baths in cool (mildly cool) water.  Do not completely dry yourself out of the shower, but allow for a little moisture to remain to aid in healing. If your burn is very severe, you may encounter blisters and leaking pus from the blisters.  It is important to keep the area clean by washing it with running water and mild soap.  Blistering of your skin means you have a second degree burn and infection becomes a concern.  It is important to see a doctor if your burn is blistering and leaking pus.  Your doctor may choose to prescribe antibiotics and can pop blisters if necessary.  Silver sulfadiazine (1% cream, Thermazene) can be used to treat sunburns. This acts as an antibiotic to help prevent infection around areas of compromised and damaged skin.  Do not use this medication on your face.  While you may be tempted to pop the blisters yourself, you run a high risk of infection. Since the skin is already damaged, it does not fight off bacterial infections effectively. It is best to let your doctor treat the blisters, as she can provide a sterile environment and tools. If you do not have a pre-made compress, dip a towel in ice-cold water and apply to the sunburned area. Apply the covered cold compress for 10 – 15 minutes several times a day. Aloe vera gel or soy-based moisturizers are the best choice since they will cool the burn. Preliminary studies have shown aloe vera to help burns heal faster. In a review of available scientific literature, patients treated with aloe vera healed almost nine days earlier (on average) than those who went without aloe vera.  Generally, medical professionals recommend that aloe is best used for minor burns and skin irritations, and should never be applied to an open wound. For soy-based moisturizers, look for organic and natural ingredients on the label.  A good example is the brand Aveeno, commonly found in most stores.  Soy is a plant that has natural moisturizing capabilities, which helps your damaged skin maintain moisture and heal. Avoid lotions or creams that contain benzocaine or lidocaine. While once used commonly in the past, these can cause irritation and allergic reactions. Avoid using petroleum oil (also known by the brand Vaseline).  Petroleum can clog pores and trap heat within the skin, preventing proper healing of your skin. Try to avoid harsh lotions with perfumes, as this could cause more irritation.  Continue using aloe vera, soy moisturizer, or a mild lotion with oatmeal. These products are currently recommended by many doctors and they will help to keep your skin moisturized with minimal irritation so that your body can naturally heal. Continue taking cool showers or baths throughout the day if you are still feeling any burning.  You can take multiple showers or baths to help the skin stay moisturized. Further exposure to the sun may cause additional damage, which may require medical attention. Your skin needs protection, so make sure to keep it covered when it is exposed to the sun or any other excessive UVR.  Wear fabrics over your sunburn that won't irritate your skin (avoid wool and cashmere specifically). There is no “best” fabric, but a loose-fitting, comfortable, and breathable fabric (such as cotton) will keep you comfortable and may provide some additional protection from the sun. Wear a hat to help protect your face from damaging UV rays of the sun. The skin on your face is especially sensitive and protecting it from the sun with a hat is a good idea. When you are considering protective fabrics and clothing, a good test is to hold up the fabric to a bright light. The most protective clothing will have very little light penetration coming through.  Avoid being outside between 10 am and 4 pm. These are peak hours for sunburn. Sunburns will heal on their own. Most sunburns will heal on their own within a few days to a few weeks. You can expect a longer time-frame if you have a second-degree burn with blistering that is closer to the 3 week healing time. Proper treatment with medical attention for second-degree blistering burns will result in the fastest recovery time.  Sunburns can usually heal completely with little to minimal evidence of scarring (if any at all).

Summary:
Wash the burned area thoroughly. Consult your doctor if your burn blisters. Apply cold compress. Apply aloe vera gel to the affected area. Keep your burn clean and moisturized. Avoid the sun while your skin in healing. Have patience.