Hi Alice
Yes I do think you should, the skin sounds sore and uncomfortable so even though he is not showing other signs of illness you should get this checked by a vet to identify the problem. Mites or skin infection are equally possible and the other hamster may get the problem too if you wait.
Cathy Wickenden BVet Med MRCVS
Barton Lodge Veterinary Centre
1 Midland Road, Hemel Hempstead, Hertfordshire, HP2 5BH
Tel: 01442 216048 24 hours
[
www.bartonlodgevets.co.uk]