These are birthmarks resulting from abnormal growth of blood vessels. Occasional medical intervention may be necessary, but they are usually harmless.

In conclusion, the appearance of red dots on the skin does not necessarily mean that you should worry. That said, it is important to consult a doctor if:

Red spots are accompanied by fever, pain, or other discomfort.
The spots increase rapidly in size, number, or intensity.
These spots are accompanied by other symptoms such as fatigue, weakness, or dizziness.