Red dots on the legs may be folliculitis on the legs. Generally folliculitis occurs in people with poor body immunity, especially those with poor local cleanliness, and if there are red dots on the legs you can take better care of the local area. Red dots on the legs may also occur in people with allergies, including substances that cause allergic reactions, such as pollen, hair dander, dust, etc. In addition, if you have eczema, red spots may also appear on your legs. One must also be aware of the presence of systemic diseases, such as systemic thrombocytopenic purpura. If you have thrombocytopenic purpura you can go to the hospital for further examination and have blood tests to rule out the cause of platelet-induced purpura.