Dense red marks on the side of the face may be related to allergies, congenital red marks, sunburns and other causes. They can be removed by medication, laser treatment, general treatment and so on. 1. Allergy: If allergy-prone people come into contact with allergens, such as pollen, animal fur and other substances can lead to skin allergies, resulting in dense red marks on the side of the face. You can follow the doctor’s instructions to take anti-allergy drugs, such as loratadine tablets, levocetirizine hydrochloride tablets, etc. to remove. 2. Congenital red marks: red birthmarks, commonly found in strawberry hemangioma, bright red nevus, resulting in dense red marks on the side of the face. It can be treated by pulsed dye laser. 3. Sunburn: Due to prolonged exposure to ultraviolet rays, the skin is sunburned, which will lead to dense red marks on the side of the face. In life, we should do a good job of sun protection, cold compresses on the face, avoid eating spicy and stimulating food, so that the marks will be slowly removed. It is recommended that patients go to the hospital for a face-to-face consultation and standardized treatment under the guidance of the doctor.