Purpura.. Hemorrhagic leather patches of different sizes. Bruising is bloody gatherings outside of blood vessels and are larger than Purpura

Purpura:

Purpura and bruising are both types of skin discoloration caused by bleeding under the skin. However, there are some key differences between the two.

Purpura is characterized by small, flat, non-raised, purple or red spots on the skin. They are caused by bleeding from small blood vessels, and they can appear anywhere on the body.

Causes:

Purpura can be caused by a variety of factors, including:

- Low platelet count:

Platelets are blood cells that help blood clot. If you have a low platelet count, your blood may not clot properly, and you may develop purpura.

- Vascular damage:

Damage to blood vessels can also cause purpura. This can be caused by a variety of factors, including injury, infection, and certain medications.

- Certain medical conditions:

Some medical conditions, such as lupus and vasculitis, can also cause purpura.

Bruising, on the other hand, is characterized by larger, raised, blue-black discolorations of the skin. They are caused by bleeding from larger blood vessels, and they typically occur after an injury. Bruising can also be caused by certain medical conditions, such as hemophilia and vitamin K deficiency.

Here is a table summarizing the key differences between purpura and bruising:

Feature	Purpura	Bruising
Size	Small (less than 10 mm in diameter)	Large (more than 10 mm in diameter)
Shape	Flat	Raised
Color	Purple or red	Blue-black
Cause	Bleeding from small blood vessels	Bleeding from larger blood vessels
Typically associated with	Low platelet count, vascular damage, certain medical conditions	Injury, certain medical conditions

If you are concerned about any skin discoloration, you should see a doctor. They can help you to determine the cause of the discoloration and recommend appropriate treatment.