Summarize:

Some discomfort, bleeding, and swelling during the first few days is common in daith and other cartilage piercings. However, persistent or worsening symptoms could be a sign that something's wrong. Contact your piercer or see a doctor if bleeding, swelling, or pain don't improve within a few days after getting your ear pierced. Note that an odorless white or light yellow discharge that dries into a crusty residue isn't pus. This is a normal part of the healing process. Pus, or foul-smelling, darker yellow or green discharge, is a sign of infection. If you see pus, carefully clean the piercing with saline, and don't remove the earring. The ring helps allow the wound to drain. Contact your piercer, see your doctor, or head to a health clinic if your piercing is infected. Without proper treatment, infected daith piercings can lead to serious complications, such as abscesses and deformed ears. An reputable piercer can recommend a doctor or clinic experienced with treating infected cartilage piercings. Treatment may include topical or oral antibiotics. If you're prescribed medication, take it according to your doctor's instructions.
Note any worsening bleeding, pain, redness, and swelling. Check for a yellow or green foul-smelling discharge. See a doctor if you notice signs of infection.