This may be a case of contact or allergic dermatitis. We need to ascertain what could be the possible triggers for this. In the presence of exposure to metals, lotions, creams, latex and other chemicals or substances, then we may be dealing with a contact or irritant dermatitis here.
Wash with warm water and use mild cleanser when washing the area. Try to avoid any possible triggers that may be contributory to the problem. Your boyfriend needs to observe surrounding circumstances or activities that may be contributory to this skin condition. At this point, I would only suggest observation as the rash resolves spontaneously. If the rash recurs again and persists then, an eczematous skin condition may need to be ascertained.
It only happens when we are laying in bed. The last time this happened was in May. He's not exposed to any chemicals at home or at work for he works in an office. The raised areas are white like huge mosquito bites..
I don't know if this makes a difference but the hand that this keeps happening on is the hand that he broke in 5 different places in a motorcycle accident.
they sound like bed bug bites.