There are two main causes of red bumps with black spots: 1, blackhead acne: red bumps with black spots may be due to excessive oil secretion in the body, pore blockage, oil oxidation in the air to form black spots, part of the patient can be secondary to folliculitis, accompanied by pain, itching, redness and other symptoms, it is recommended to pay attention to local skin hygiene, maintain a clean state, avoid eating greasy, irritating food; 2, papulosquamous Urticaria: Papular urticaria can also appear red bumps with black spots, papular urticaria is caused by mosquito bites skin allergies, you can take oral anti-allergy drugs or topical glycolic lotion, etc., the diet must be light, do not eat too greasy food, avoid scratching, it is recommended that treatment be carried out under the guidance of a doctor. If only one red bumps with black dots appear on the skin, it is recommended to give priority to blackhead acne. Papular urticaria is usually more in number, accompanied by itchy skin and sometimes visible blisters.