Itchy Bites, unknown cause, 3 months and no end in sight.

Okay this started about 3 months ago when the weather started getting warm, these bites first appeared on my husband about a week before me. They are located along the gluteal cleft and inner thigh areas. The bite remained in just this area for about 3 weeks then more showed up on our hips, back of knees, stomachs, and armpit areas. They itch the worst at night, we've tried benedryll, aloe, everything! The bites started as itchy red bumps and now they're kind of itchy, dark, and scaly bumps. No bugs were found in the house anywhere, we even bombed the house and my 9 month old has recently received ONE similar bite on his armpit, please help before it gets worse on my child! Also we are quite tired of the itching induced insomnia.
I'm not entirely sure this related: Just affected me, brief sun induced rash for 2 weeks just on my arms 2 months after the bites, I haven't been able to have a sunburn for 8 years as my skin became accustomed to the sun. Thank you for any help!