itchy rashes..please help

Dear friends,

for the past 2 days i am been getting itchy red rashes on my neck,upper hands,side of stomach,and back of legs. the rashes resembles like ant bites in looks and i feel like itching a lot and it becomes red once i itch. then after an hour or so it goes of on its own. it reappears without any reason. I have not eaten anything abnormal or outside food. I fully dusted by bed and changed the sheets yesterday. I have been applying calamine lotion on the affected area which reduces itchyness, but does not cure it, as it reoccurs.

Has anyone experienced something like this? Please suggest home remedy for this. Or do you think it is better to show a doc? kindly advice.

Cheers,
dolly