My 10 yr old grandson has been complaining of itching first few days all over... Next few mostly outside of hands and ankles. He says it feels like a million bee stings. We have been giving Benadryl and Motrin which has helped. There is a very slight redness in those areas ,no bumps ,or real rash. His baby sister has a similar rash ,and a little cousin has had one for about a month, now confined to the diaper area. He seems very agitated whe at its worse. He has been lying low. , usually very active . Is there a virus with these symptoms ? Should we be concerned?