Yellow patch, itching, burning on body.

Its been 8 months since it started. on my body anywhere, small spot appears like a mosquito bite, but itches severely when is brushed by clothes, then that spot gradually increases taking a form of yellow colored patch bigger than a palm size or spreads over whole area for eg. thigh. it itches and burns so severely, its unbearable. Initially, it appeared only on thighs between 15 days gaps & lasted for 2-3 days. But after 2 months, it started appearing anywhere on body, also the gaps between appearance started decreasing it came after 10 days. After 6 months. it appeared anywhere on body & the gaps reduced to 2 days. Now it appears on daily basis. if i take medicine recommended by local doctor its in control for a day. but if i miss my medicine one day, that means i have to suffer next day. *few things might be the cause but not sure as they haven't proved themselves yet. Dust, Bedbugs, Oily food, Acidity, Body Heat, late night sleep, hot temperature, etc. I eat only homemade food.