My 89 yr mom had many infections over the last 3 years, and had iv antibiotics as well asoral antibiotics. One week afterthe last treatment, she developed extreme itching firston the neck and the upper chest. I gave her antihistamines, applied vit e lotion and erythromicin cream. At first the antihistamine worked 12 hours although it was meant for 24 hours. Then I also put alcohol and betadine but still the itching continued. Then I remembered our dog tickshad not been treated for some time and because her bed is on the ground floor she may have been infected by people who come inside her room with dirty shoes and sandals. Or, our helper who gives her some kind of bath ( with a towel) may have used something dirty;