The causes of small red dots on pregnant women include allergic skin diseases, spider nevus and elevated bile acids, as follows:1. Allergic skin diseases: such as itchy rash of pregnancy, mainly due to the low immunity of the body after pregnancy, causing an allergic skin reaction, erythema and papules in the abdomen, which may also be accompanied by itching. In terms of treatment, if there is a small amount of scattered erythema and papules, and the itching is mild, you can apply topical application of furnace glycolic lotion and do not need to take oral medication. If there is a large amount of red papules and red spots on the abdomen, accompanied by intense itching, which affects sleep at night, you can take oral chlorpheniramine maleate tablets and calcium carbonate D3 chewable tablets, and in terms of topical medication, you can use a mixture of mometasone glycolate cream and urea vitamin E cream for topical use; 2. spider nevus: mainly due to abnormal estrogen metabolism after pregnancy, which causes a large number of spider nevus on the skin. After three months, this hormone level will gradually fall back to the normal level, so generally no treatment is needed. 3. elevated bile acid: causing small red dots on pregnant women, it is recommended that patients go to the gastroenterology department of a regular hospital for auxiliary liver function tests. If the bile acid is too high, you need to carry out the appropriate treatment under the guidance of a doctor. Therefore, for small red dots on pregnant women, you need to go to a regular hospital to find a qualified doctor to conduct the appropriate laboratory tests, so as to carry out diagnosis and treatment.