From swallowing:
From breathing in (inhaling) the acid:
From touching the acid:
Chemical Emergencies: Case Definition: Hydrofluoric Acid. Centers for Disease Control and Prevention, US Dept of Health and Human Services; 2005.
Seamens CM, Seger DL, Meredith T. Hydrofluoric acid. In: Ford MD, Delaney KA, Ling LJ, Erickson T, eds. Clinical toxicology. Philadelphia, PA: WB Saunders; 2001:1019-26.