War Stories-CDC
Case 1: A A paper towel wet with 5% v/v HF solution was picked up with a bare hand by a CDC chemist.  The worker did not wash their hands immediately.  After a few hours, stinging and a deep-tissue soreness began under the skin on one of the fingertips of that hand.  The laboratory worker was sent to the CDC clinic for consult and treatment.  After treatment, stinging was relieved and soreness went away in a 1-2 days. No further treatment was required.
Case 2: HF solution (5%) was splashed out of a spray chamber and inhaled.  Worker first flushed nostrils with water for about 10 seconds, then rubbed a small amount of calcium gluconate in the nasal membranes, and did a telephone consult with the CDC clinic.  No adverse effects were noted.