Hi welcome to HCM.
There could be a multiple reasons for a blood shot eye ( starting from an infection or a Sub conjunctival Haemorrhage or even an allergy
). Since you haven't mentioned
about associated symptoms like pain/itching/discharge/blurred vision
....... I would suggest him warm compresses and a direct examination by your nearest ophthalmologist to treat for the cause.
It is not advisable to use any topical eye drops/ ointment without knowing the exact cause as there are many OTC drugs which might worsen his problem .