Swollen face with a little hardness is considered to be related to frostbite, mosquito bites, skin infections and other factors. 1. Frostbite: the face is swollen and a little hard, if it occurs in the cold winter, you need to know whether it is related to frostbite. If you are often in a cold environment, do not pay attention to facial warmth, frostbite may be formed, resulting in localized swelling and hardness. 2. Mosquito bites: often in and out of parks, jungles and other mosquito-infested environments, mosquito bites on the face, resulting in localized swelling, hardness, and may cause pain and itching. 3. Skin infection: facial swelling, hardness, but also to understand whether the skin infection. If there is a slight break in the skin, the pathogenic bacteria invade and cause localized swelling, hardness, redness, pain and so on. Facial swelling, hardness, it is recommended to pay attention to the hospital dermatology examination in a timely manner to find the cause, but also for the cause of the appropriate drug treatment.