Randomly get these above my armpits, I’ll have a normal day without any activity then wake up with marks. What is it? (photos)

Based on your description, it sounds like you might be experiencing petechiae or purpura, which are small red or purple spots caused by bleeding under the skin. These can sometimes appear after physical activities like push-ups due to increased pressure or minor trauma to the blood vessels. However, if they are appearing randomly without any physical activity, it could be due to other factors such as:

Platelet or clotting disorders: Issues with your blood's ability to clot can lead to spontaneous bruising or petechiae.
Infections: Certain viral or bacterial infections can cause these symptoms.
Medications: Some medications, especially those that affect blood clotting, can cause similar skin changes.
Nutritional deficiencies: Deficiencies in vitamins like vitamin C or vitamin K can affect your skin and blood vessels.
While you mention there's no pain and you're not overly concerned, it's always a good idea to consult with a healthcare professional for a proper assessment, especially if these spots continue to appear or increase in frequency. They can provide a definitive diagnosis and ensure there are no underlying health issues.