Slice an onion and rub it on the sting.
The onion enzymes neutralize the bee venom and reduce swelling and itching. Homeopathic apis mellifica will also help. Use three ties a day for a coupke days. The onion works so well you may not need the homeopathic. On the finger it may takse a coupke slices. If he has any systemic symptoms like trouble breathing face swelling etc call 911= allergic rxn.