I wouldnt panic as its probably nothing much.

You CAN get infection in the milk ducts in your breast which is what it could be, or it could be a simple infection of the nipple. We see this all the time in breastfeeding women but it can happen outside of that too.

If your hormones are out of whack that could absolutely be whats causing the discharge, your body could literally be in milk production mode and producing a tiny bit of milk. Nothing to panic about either.

In the mean time to see you doc, you can try warm showers on the area, cold compresses (cold, not icy) and massage GENTLY to see if that helps.