Letter from treating Doctor
Carry a letter from your treating doctor with information about your bleeding condition, any blood-borne viruses you may have, and the usual treatment you receive. This letter should, if possible, be in the language of the country being visited. You may not always be able to treat yourself, so this information is important.
Letter for Customs, Port of Entry
Carry a letter to present to customs, if requested, to explain why you are carrying treatment products, prescribed drugs, needles, and syringes. Again, this letter should be in the language of the country being visited.
Letter for Airport Airline Security
Carry a letter for security staff at your port of exit or entry, explaining why you are carrying treatment products, prescribed drugs, needles, syringes etc., and the serious implications of not having them immediately to hand.