these sound like clothes moths. they seem to be particularly flúirseach this year and will do lots of damage to clothes wool books paper and feathers. they are small moths which fly by day and there seems to be a smaller one too. they can't bite so i'd say the person who was bitten was bitten by a midge while watching the moth. midges seem to invading houses as well these days and not always at dusk
rigourous hoovering, disinfecting and clothes washing and airing are the best means of combat, together with strong smelling substances like camphor, tea tree, mugwort lavender etc. they will prosper in dark warm dampish areas, carpeted or not. lots of work to get rid of them.