The delicate lining of your nasal passages can become dry, irritated, and inflamed from the infection, blowing your nose, or using nasal sprays like saline or decongestants. This irritation can cause tiny blood vessels to break slightly, resulting in occasional blood-tinged discharge. To help it heal, try keeping your nasal passages moist using a humidifier or a gentle saline nasal spray. Please avoid hard nose-blowing. While this is usually harmless and resolves on its own, it is always a good idea to see a doctor if it worsens or persists.
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