The causes of red bumps on the legs like mosquito bags are as follows: 1, red bumps in the follicles of the parts, bumps on the white tip does not itch slightly painful or pain, consider folliculitis is due to bacterial infection of the pores caused by the use of Pepto-Bismol ointment to wipe the affected area.2, red bumps to itch mainly, the shape of the shape of not fixed over a few hours of their own subside to consider urticaria, with the use of glycerine lotion to wipe the affected area, oral loratadine, vitamin C, Calcium tablets, anti-allergy, anti-itching. 3, pimples began to only the size of a grain of rice gradually increased, touch the pimples hard, surface roughness, itching is considered to be nodular itchy rash, with skin disease Ning paste the affected area, the effect of drug treatment is not good, you can local subcutaneous injection of tretinoin or go to the hospital to use a laser, cryotherapy and other physical methods of treatment. 4, allergic to a substance or drug caused by red pimples on the legs, stop the drug, away from the allergen, intramuscular injection of paracetamol, and so on. Allergens, intramuscular injection of paracetamol in 3-5 days, the pimples can subside.