"How do broken capillaries and thread veins occur? What causes them and what is the process of their formation?"
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These veins can be caused by many factors, such as allergies, hot water, friction, incorrect extractions, etc. The walls contain collagen, and with constant expansion due to increased blood flow, these walls can get distended, leading to blood pooling; it appears on the surface, like the thread veins that you mentioned.

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