Is he scratching them?
It could be bed bugs but it could just be an infection
I have the same problem with my skin at this time of the year. E45 cream helps. If it continues he could see the doctor who may prescribe something stronger if it's a fungal infection
Get some lanacane cream from the chemist tomorrow, put copious amounts all over the itchy area, it will give some relief until the doc can have a look at it.
If you're going to the chemist as suggested by daffy, get your bloke to go too, and ask the pharmacist to take a look it - he may be able to identify it straight away and you may not need a prescription.