6. Patches of Skin Turning Red or Blue
In the early stages of blood clot forms it may be possible to see a change in color of the skin at the affected area of the body, or close to it. When this change has occurred because of a clot, it is due to the fact that the flow of blood has been restricted in that general area and what you are seeing is the redness from the blood gathering under the skin, unable to move along as usual. If nothing is done to remedy this situation then it will usually become more noticeable over time as more blood becomes trapped.
In the case of skin turning a bluish or purplish tone, this can also be a sign of a blood clot – the flow of blood has become so restricted that the affected skin is not receiving enough oxygen. This is called cyanosis. This could sometimes be mistaken as a bruise, but if it doesn’t go away you will need to consult a doctor.