Itchy bumps like bug bites - what is it?

Last summer I started to notice itchy bite-like bumps appearing on my skin.  They look like normal bug bites (though my bug bites usually turn to welts), but I cannot see an entry point.  They are raised and red and usually appear in groups of two or three.  They usually only appear between my breasts and my knees, and on my arms and back, and also sometimes on my feet/ankles.  They are very itchy and unsightly.  I'm not aware of any allergies, but to be sure I have changed my deodorant, lotions, detergents, soaps, etc.  Nothing helped.  I don't see any signs of bed bugs, but I have found a flea or two in my house.  However my boyfriend (who I live with) and my cats are never itchy.  These "bites" just appear randomly, usually over night, but sometimes during the day also.  I have done research online but cannot find anything that matches my symptoms.  Do you have any suggestions as to what it could be?

[ChrystalluvsJake]

I have the same problem....I wish I know what it was....

[trippinout]

I have the same thing, I also wish I knew what it was???? I get them on my arms and lower legs they itch like crazy and swell... I dont know what it is they comme in at random times and place....

HELP

[Kenny1948]

I too have the same problem.  I have two on my upper arm near my armpit. They look like mosquito bites, but are still there after two days, and they itch intensely. Have used benadryl, but so far it hasn't helped.