Bites from bed bugs will usually look like a red welt that is extremely itchy and irritating. The welts can also bleed and appear in small dots in groups in a specific part of your body. Sometimes you may also notice a raised center around the affected area. Some people can also get allergic reactions to the bites besides the small dots is also worth mentioning. There can also be cases where victims may experience nausea, fever, blisters, and difficulty in breathing.