The tiny red dots you are describing could be a result of broken blood vessels near the surface of the skin due to scratching during the anxiety attack. These are often referred to as petechiae, which are small, pinpoint-sized red or purple spots.
The fact that the scratch has turned into a thick patch of scab, is sensitive, and warm to the touch might indicate that the area has become infected. Scratching the skin can introduce bacteria, and if not properly cleaned, an infection may develop.
It's essential to seek medical attention to get a proper diagnosis and treatment for your condition. A healthcare professional will be able to assess the severity of the scratch, whether there is an infection, and suggest the appropriate steps for care and healing.
In the meantime, avoid scratching the affected area further, keep it clean and dry, and consider applying a mild antiseptic or antibiotic ointment if recommended by a healthcare professional. If you experience any other symptoms or the condition worsens, don't hesitate to seek immediate medical attention. Anxiety attacks and self-harm are serious concerns, and it's crucial to address them with the help of a mental health professional as well.