My husband came back from the gym and he has a...

Treatment of swelled vein in palm

It is common problem common as your hasbund was in Gym. Firstly, your hasbund has to relax and avoid exhausted work and exercises these days to rest his muscles. Massage your hasbund muscles by hot water to relax muscles to decrease swelling. Apply toipcal analgesics like FAST RELIEFE GEL three times daily to relieve pain. Prescribe muscle relaxant like RELAXONE tabs three times daily to relax muscles. 

Investigations to do

Just clinical examination by an orthopedic doctor and x ray for the hand.

Advice

Your husband has to visit orthopedic doctor for clinical examination