There may be several reasons for red dots on the chest: 1, allergies, if consuming certain foods or underwear with poor materials, may cause red rashes all over the body, you can take oral Xanthemin anti-allergy, it is advisable to consult a hospital to do allergen monitoring to avoid the next reoccurrence. 2, platelets are too low, if the platelets are extremely low may lead to bleeding dots on the skin, you can check the mouth and both lower limbs for other bleeding spots. If there are also bleeding spots, it is recommended to consult a hospital for routine blood tests, if the platelets are low caused by possible hematological diseases, such as aplastic anemia, myelodysplastic syndrome. 3, acne, if the skin hyperkeratosis causes pore blockage, thus forming acne, may also be caused by local capillary hyperplasia, usually pay more attention to the cleanliness of the breast.