Suggest Treatment For Skin Allergies Like Red Spots All Over Body

i am 72 year old lady suffering from skin allergy like red spots at ahands , legs, thigh & very major in both hands fingers & palm, itching very severly , un bearable & sometimes blood or water comes out , pl. suggest where can i get done allergic test ahmedabad , ihave taken treatments from 3 different doctors but while taking medicines it subside partially & then again emerges with double speed.