Talk to Dermatologist on Allergy Infection

I have allergy on underlegs area since january. At start it is just one small cirle patch with bumps. Later it become larger patches. Last year in sep my mother got this allergy she got treatment and fine now. My sons one was one only two months old when he got allergy(sep2019) and other is 1.5yr younger one was allergy free in 2months(dec2019) without medicine just used oinments. Elder son still have this allergy. I have got this in january. The treatment we had by consulting many dr: i used these medicines. Terbisil tablet danzen tablet scabid lotion dermosporin (3weeks) , but no cure, then in april start taking Fungone tablet once in week for regular 6weeks no cure, again consult with Dr she prescribed Itrazox twice a day, Alflex once a day for 6weeks (15july-31aug).. When using medicine it fine but after completing course come back or re appear. I just got tired its itching bumpy scars in circles . I am very careful in clothes washing use dettole washed seprate clothes of all membe